1
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Fu X, Hu X. Ultrasound-Controlled Prodrug Activation: Emerging Strategies in Polymer Mechanochemistry and Sonodynamic Therapy. ACS APPLIED BIO MATERIALS 2024. [PMID: 38698527 DOI: 10.1021/acsabm.4c00150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Ultrasound has gained prominence in biomedical applications due to its noninvasive nature and ability to penetrate deep tissue with spatial and temporal resolution. The burgeoning field of ultrasound-responsive prodrug systems exploits the mechanical and chemical effects of ultrasonication for the controlled activation of prodrugs. In polymer mechanochemistry, materials scientists exploit the sonomechanical effect of acoustic cavitation to mechanochemically activate force-sensitive prodrugs. On the other hand, researchers in the field of sonodynamic therapy adopt fundamentally distinct methodologies, utilizing the sonochemical effect (e.g., generation of reactive oxygen species) of ultrasound in the presence of sonosensitizers to induce chemical transformations that activate prodrugs. This cross-disciplinary review comprehensively examines these two divergent yet interrelated approaches, both of which originated from acoustic cavitation. It highlights molecular and materials design strategies and potential applications in diverse therapeutic contexts, from chemotherapy to immunotherapy and gene therapy methods, and discusses future directions in this rapidly advancing domain.
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Affiliation(s)
- Xuancheng Fu
- Department of Chemistry, BioInspired Institute, Syracuse University, Syracuse, New York 13244, United States
| | - Xiaoran Hu
- Department of Chemistry, BioInspired Institute, Syracuse University, Syracuse, New York 13244, United States
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2
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Chang HC, Liang MC, Luc VS, Davis C, Chang CC. Mechanochemical Reactivity of a 1,2,4-Triazoline-3,5-dione-Anthracene Diels-Alder Adduct. Chem Asian J 2024; 19:e202300850. [PMID: 37938167 DOI: 10.1002/asia.202300850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 10/31/2023] [Accepted: 11/05/2023] [Indexed: 11/09/2023]
Abstract
Force-responsive molecules that produce fluorescent moieties under stress provide a means for stress-sensing and material damage assessment. In this work, we report a mechanophore based on Diels-Alder adduct TAD-An of 4,4'-(4,4'-diphenylmethylene)-bis-(1,2,4-triazoline-3,5-dione) and initiator-substituted anthracene that can undergo retro-Diels-Alder (rDA) reaction by pulsed ultrasonication and compressive activation in bulk materials. The influence of having C-N versus C-C bonds at the sites of bond scission is elucidated by comparing the relative mechanical strength of TAD-An to another Diels-Alder adduct MAL-An obtained from maleimide and anthracene. The susceptibility to undergo rDa reaction correlates well with bond energy, such that C-N bond containing TAD-An degrades faster C-C bond containing MAL-An because C-N bond is weaker than C-C bond. Specifically, the results from polymer degradation kinetics under pulsed ultrasonication shows that polymer containing TAD-An has a rate constant of 1.59×10-5 min-1 , while MAL-An (C-C bond) has a rate constant of 1.40×10-5 min-1 . Incorporation of TAD-An in a crosslinked polymer network demonstrates the feasibility to utilize TAD-An as an alternative force-responsive probe to visualize mechanical damage where fluorescence can be "turned-on" due to force-accelerated retro-Diels-Alder reaction.
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Affiliation(s)
- Hao-Chun Chang
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, No. 1001, Daxue Rd. East Dist., Hsinchu City, 300093, Taiwan
- Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu, 300093, Taiwan
| | - Min-Chieh Liang
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, No. 1001, Daxue Rd. East Dist., Hsinchu City, 300093, Taiwan
- Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu, 300093, Taiwan
| | - Van-Sieu Luc
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, No. 1001, Daxue Rd. East Dist., Hsinchu City, 300093, Taiwan
- Sustainable Chemical Science and Technology (SCST), Taiwan International Graduate Program (TIGP), Academia Sinica, Taipei, 11529, Taiwan
- Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan
| | - Chelsea Davis
- Department of Mechanical Engineering, University of Delaware, Newark, Delaware, 19716, U.S.A
| | - Chia-Chih Chang
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, Taiwan, No. 1001, Daxue Rd. East Dist., Hsinchu City, 300093, Taiwan
- Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University, Hsinchu, 300093, Taiwan
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3
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Suga K, Yamakado T, Saito S. Dual Ratiometric Fluorescence Monitoring of Mechanical Polymer Chain Stretching and Subsequent Strain-Induced Crystallization. J Am Chem Soc 2023. [PMID: 38051032 DOI: 10.1021/jacs.3c09175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2023]
Abstract
Tracking the behavior of mechanochromic molecules provides valuable insights into force transmission and associated microstructural changes in soft materials under load. Herein, we report a dual ratiometric fluorescence (FL) analysis for monitoring both mechanical polymer chain stretching and strain-induced crystallization (SIC) of polymers. SIC has recently attracted renewed attention as an effective mechanism for improving the mechanical properties of polymers. A polyurethane (PU) film incorporating a trace of a dual-emissive flapping force probe (N-FLAP, 0.008 wt %) exhibited a blue-to-green FL spectral change in a low-stress region (<20 MPa), resulting from conformational planarization of the probe in mechanically stretched polymer chains. More importantly, at higher probe concentrations (∼0.65 wt %), the PU film showed a second spectral change from green to yellow during the SIC growth (20-65 MPa) due to self-absorption of scattered FL in a short wavelength region. The reversibility of these spectral changes was demonstrated by load-unload cycles. With these results in hand, the degrees of the polymer chain stretching and the SIC were quantitatively mapped and monitored by dual ratiometric imaging based on different FL ratios (I525/I470 and I525/I600). Simultaneous analysis of these two mappings revealed a spatiotemporal gap in the distribution of the polymer chain stretching and the SIC. The combinational use of the dual-emissive force probe and the ratiometric FL imaging is a universal approach for the development of soft matter physics.
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Affiliation(s)
- Kensuke Suga
- Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Takuya Yamakado
- Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shohei Saito
- Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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4
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Huo Z, Arora S, Kong VA, Myrga BJ, Statt A, Laaser JE. Effect of Polymer Composition and Morphology on Mechanochemical Activation in Nanostructured Triblock Copolymers. Macromolecules 2023; 56:1845-1854. [PMID: 36938512 PMCID: PMC10018773 DOI: 10.1021/acs.macromol.2c02475] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 02/07/2023] [Indexed: 03/06/2023]
Abstract
The effect of composition and morphology on mechanochemical activation in nanostructured block copolymers was investigated in a series of poly(methyl methacrylate)-block-poly(n-butyl acrylate)-block-poly(methyl methacrylate) (PMMA-b-PnBA-b-PMMA) triblock copolymers containing a force-responsive spiropyran unit in the center of the rubbery PnBA midblock. Triblock copolymers with identical PnBA midblocks and varying lengths of PMMA end-blocks were synthesized from a spiropyran-containing macroinitiatior via atom transfer radical polymerization, yielding polymers with volume fractions of PMMA ranging from 0.21 to 0.50. Characterization by transmission electron microscopy revealed that the polymers self-assembled into spherical and cylindrical nanostructures. Simultaneous tensile tests and optical measurements revealed that mechanochemical activation is strongly correlated to the chemical composition and morphologies of the triblock copolymers. As the glassy (PMMA) block content is increased, the overall activation increases, and the onset of activation occurs at lower strain but higher stress, which agrees with predictions from our previous computational work. These results suggest that the self-assembly of nanostructured morphologies can play an important role in controlling mechanochemical activation in polymeric materials and provide insights into how polymer composition and morphology impact molecular-scale force distributions.
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Affiliation(s)
- Zijian Huo
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Ave., Pittsburgh, Pennsylvania 15260, United States
| | - Swati Arora
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Ave., Pittsburgh, Pennsylvania 15260, United States
| | - Victoria A. Kong
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Ave., Pittsburgh, Pennsylvania 15260, United States
| | - Brandon J. Myrga
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Ave., Pittsburgh, Pennsylvania 15260, United States
| | - Antonia Statt
- Materials
Science and Engineering, Grainger College of Engineering, University of Illinois, Urbana−Champaign, Illinois 61801, United States
| | - Jennifer E. Laaser
- Department
of Chemistry, University of Pittsburgh, 219 Parkman Ave., Pittsburgh, Pennsylvania 15260, United States
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5
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Watabe T, Otsuka H. Swelling-induced Mechanochromism in Multinetwork Polymers. Angew Chem Int Ed Engl 2023; 62:e202216469. [PMID: 36524463 DOI: 10.1002/anie.202216469] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/06/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022]
Abstract
We report a novel and versatile approach to achieving swelling-induced mechanochemistry using a multinetwork (MN) strategy that enables polymer networks to repeatedly swell with monomers and solvents. The isotropic expansion of the first network (FN) provides sufficient force to drive the mechanochemical scission of a radical-based mechanophore, difluorenylsuccinonitrile (DFSN). Although prompt recombination generally occurs in such highly mobile environments, the resulting pink radicals are kinetically stabilized in the gels, probably due to limited diffusion in the extended polymer chains. Moreover, the DFSN embedded in the isotropically strained chain exhibits increased thermal reactivity, which can be reasonably explained by an entropic contribution of the FN to the dissociation. The utility of the MN polymers is demonstrated not only in terms of swelling-force-induced network modification, but also in the context of tunable reactivity of the dissociative unit through proper design of the hierarchical network architecture.
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Affiliation(s)
- Takuma Watabe
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan
| | - Hideyuki Otsuka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan.,Living Systems Materialogy (LiSM) Research Group, International Research Frontiers Initiative (IRFI), Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8501, Japan
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6
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Ducker RE, Brügge OS, Meijer AJHM, Leggett GJ. Tribochemical nanolithography: selective mechanochemical removal of photocleavable nitrophenyl protecting groups with 23 nm resolution at speeds of up to 1 mm s -1. Chem Sci 2023; 14:1752-1761. [PMID: 36819865 PMCID: PMC9931061 DOI: 10.1039/d2sc06305k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 01/14/2023] [Indexed: 01/18/2023] Open
Abstract
We describe the mechanochemical regulation of a reaction that would otherwise be considered to be photochemical, via a simple process that yields nm spatial resolution. An atomic force microscope (AFM) probe is used to remove photocleavable nitrophenyl protecting groups from alkylsilane films at loads too small for mechanical wear, thus enabling nanoscale differentiation of chemical reactivity. Feature sizes of 20-50 nm are achieved repeatably and controllably at writing rates up to 1 mm s-1. Line widths vary monotonically with the load up to 2000 nN. To demonstrate the capacity for sophisticated surface functionalisation provided by this strategy, we show that functionalization of nanolines with nitrilo triacetic acid enables site-specific immobilization of histidine-tagged green fluorescent protein. Density functional theory (DFT) calculations reveal that the key energetic barrier in the photo-deprotection reaction of the nitrophenyl protecting group is excitation of a π-π* transition (3.1 eV) via an intramolecular charge-transfer mechanism. Under modest loading, compression of the adsorbate layer causes a decrease in the N-N separation, with the effect that this energy barrier can be reduced to as little as 1.2 eV. Thus, deprotection becomes possible via either absorption of visible photons or phononic excitation transfer, facilitating fast nanolithography with a very small feature size.
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Affiliation(s)
- Robert E. Ducker
- Department of Chemistry, University of SheffieldBrook HillSheffield S3 7HFUK
| | - Oscar Siles Brügge
- Department of Chemistry, University of Sheffield Brook Hill Sheffield S3 7HF UK
| | | | - Graham J. Leggett
- Department of Chemistry, University of SheffieldBrook HillSheffield S3 7HFUK
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7
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Lloyd EM, Vakil JR, Yao Y, Sottos NR, Craig SL. Covalent Mechanochemistry and Contemporary Polymer Network Chemistry: A Marriage in the Making. J Am Chem Soc 2023; 145:751-768. [PMID: 36599076 DOI: 10.1021/jacs.2c09623] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Over the past 20 years, the field of polymer mechanochemistry has amassed a toolbox of mechanophores that translate mechanical energy into a variety of functional responses ranging from color change to small-molecule release. These productive chemical changes typically occur at the length scale of a few covalent bonds (Å) but require large energy inputs and strains on the micro-to-macro scale in order to achieve even low levels of mechanophore activation. The minimal activation hinders the translation of the available chemical responses into materials and device applications. The mechanophore activation challenge inspires core questions at yet another length scale of chemical control, namely: What are the molecular-scale features of a polymeric material that determine the extent of mechanophore activation? Further, how do we marry advances in the chemistry of polymer networks with the chemistry of mechanophores to create stress-responsive materials that are well suited for an intended application? In this Perspective, we speculate as to the potential match between covalent polymer mechanochemistry and recent advances in polymer network chemistry, specifically, topologically controlled networks and the hierarchical material responses enabled by multi-network architectures and mechanically interlocked polymers. Both fundamental and applied opportunities unique to the union of these two fields are discussed.
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Affiliation(s)
- Evan M Lloyd
- Department of Chemistry, Duke University, Durham, North Carolina27708, United States
| | - Jafer R Vakil
- Department of Chemistry, Duke University, Durham, North Carolina27708, United States.,NSF Center for the Chemistry of Molecularly Optimized Networks, Duke University, Durham, North Carolina27708, United States
| | - Yunxin Yao
- Department of Chemistry, Duke University, Durham, North Carolina27708, United States.,NSF Center for the Chemistry of Molecularly Optimized Networks, Duke University, Durham, North Carolina27708, United States
| | - Nancy R Sottos
- NSF Center for the Chemistry of Molecularly Optimized Networks, Duke University, Durham, North Carolina27708, United States.,Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois61801, United States
| | - Stephen L Craig
- Department of Chemistry, Duke University, Durham, North Carolina27708, United States.,NSF Center for the Chemistry of Molecularly Optimized Networks, Duke University, Durham, North Carolina27708, United States
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8
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9
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Aomura K, Yasuda Y, Yamada T, Sakai T, Mayumi K. Quasi-elastic neutron scattering study on dynamics of polymer gels with controlled inhomogeneity under uniaxial deformation. SOFT MATTER 2022; 19:147-152. [PMID: 36477753 DOI: 10.1039/d2sm00784c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
We study the segmental and monomer dynamics of polymer gels with controlled inhomogeneity under uniaxial deformation by means of quasi-elastic neutron scattering (QENS). In order to clarify the effect of the homogeneity of a network structure on the polymer dynamics in gels, we compare two types of polymer gels with controlled homogeneity: a homogeneous tetra-PEG gel (homo-gel) prepared from uniform tetra-arm pre-polymers and a heterogeneous tetra-PEG gel (hetero-gel) with a small amount of shorter tetra-PEG pre-polymer. The different inhomogeneity in the homo-gel and the hetero-gel has little effect on the average relaxation time of the chain dynamics in the undeformed state. The difference in the local dynamics in the gels is emphasized under uniaxial deformation: while the homo-gel shows a single relaxation mode, the hetero-gel exhibits a bimodal distribution of relaxation times with a slow dynamic mode ascribed to highly stretched short strands, which causes a more brittle macroscopic fracture compared with that in the case of the homo-gel.
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Affiliation(s)
- Kosuke Aomura
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-Shi, Chiba, 277-8581, Japan
| | - Yusuke Yasuda
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
| | - Takeshi Yamada
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), IQBRC Bldg., 162-1 Shirakata, Tokai, Naka, Ibaraki 319-1106, Japan
| | - Takamasa Sakai
- Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - Koichi Mayumi
- Material Innovation Research Center (MIRC) and Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan.
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa-Shi, Chiba, 277-8581, Japan
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10
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Hertel R, Maftuhin W, Walter M, Sommer M. Conformer Ring Flip Enhances Mechanochromic Performance of ansa-Donor-Acceptor-Donor Mechanochromic Torsional Springs. J Am Chem Soc 2022; 144:21897-21907. [PMID: 36414534 DOI: 10.1021/jacs.2c06712] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Mechanochromophores based on conformational changes of donor-acceptor-donor (DAD) springs allow sensing of forces acting on polymer chains by monotonic changes of absorbance or photoluminescence (PL) wavelength. Here, we identify a series of thiophene (D)-flanked quinoxalines (A) as molecular torsional springs for force sensing in bulk polymers at room temperature. The mode of DAD linkage to the polymer matrix and linker rigidity are key parameters that influence the efficacy of force transduction to the DAD spring and thus mechanochromic response, as probed by in situ PL spectroscopy of bulk films during stress-strain experiments. The largest shift of the PL maximum, and thus the highest sensitivity, is obtained from an ansa-DAD spring exhibiting bridged D units and a stiff A linker. Using detailed spectroscopy and density functional theory calculations, we reveal conformer redistribution in the form of a thiophene ring flip as the major part of the overall mechanochromic response. At forces as low as 27 pN at early stages of deformation, the ring flip precedes mechanically induced planarization of the ansa-DAD spring, the latter process producing a PL shift of 21 nm nN-1. Within the stress-strain diagram, the thiophene ring flip and DAD planarization are thus two separated processes that also cause irreversible and reversible mechanochromic responses, respectively, upon sample failure. As the thiophene ring flip requires much smaller forces than planarization of the DAD spring, such micromechanical motion gives access to sensing of tiny forces and expands both sensitivity and the force range of conformational mechanochromophores.
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Affiliation(s)
- Raphael Hertel
- Institute for Chemistry, Chemnitz University of Technology, Chemnitz09111, Germany
| | - Wafa Maftuhin
- FIT Freiburg Centre for Interactive Materials and Bioinspired Technologies, University of Freiburg, Freiburg79110, Germany.,Cluster of Excellence livMatS @ FIT, Freiburg79110, Germany
| | - Michael Walter
- FIT Freiburg Centre for Interactive Materials and Bioinspired Technologies, University of Freiburg, Freiburg79110, Germany.,Cluster of Excellence livMatS @ FIT, Freiburg79110, Germany.,Fraunhofer IWM, MikroTribologie Centrum μTC, Freiburg79108, Germany
| | - Michael Sommer
- Institute for Chemistry, Chemnitz University of Technology, Chemnitz09111, Germany
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11
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Sun C, Zhang S, Ren Y, Zhang J, Shen J, Qin S, Hu W, Zhu S, Yang H, Yang D. Force-Induced Synergetic Pigmentary and Structural Color Change of Liquid Crystalline Elastomer with Nanoparticle-Enhanced Mechanosensitivity. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2205325. [PMID: 36310104 PMCID: PMC9798961 DOI: 10.1002/advs.202205325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/08/2022] [Indexed: 06/04/2023]
Abstract
The ability of some animals to rapidly change their colors can greatly improve their chances of escaping predators or hunting prey. A classic example is cephalopods, which can rapidly shift through a wide range of colors. This ability is based on the synergetic effect of the change of pigmentary and structural colors exhibited by their own two categories of color-changing cells: supernatant chromatophores offer various pigmentary colors and lower iridophores or leucophores reflect the different structural colors by adjusting their periodicities. Here, a mechanochromic liquid crystalline elastomer with force-induced synergetic pigmentary and structural color change, whose mechanosensitivity is enhanced by the stress-concentration induced by the doped nanoparticle, is presented. The materials have a large color-changing gamut and high mechanochromic sensitivity, which exhibit great potential in the field of mechanical detectors, sensors, and anti-counterfeiting materials.
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Affiliation(s)
- Chang Sun
- University of Science and Technology BeijingNo. 30 Xueyuan Road, Haidian DistrictBeijing100083China
| | - Shuoning Zhang
- Peking UniversityNo. 5 Yiheyuan Road Haidian DistrictBeijing100871P. R. China
| | - YunXiao Ren
- University of Science and Technology BeijingNo. 30 Xueyuan Road, Haidian DistrictBeijing100083China
| | - Jianying Zhang
- University of Science and Technology BeijingNo. 30 Xueyuan Road, Haidian DistrictBeijing100083China
| | - Jiyuan Shen
- University of Science and Technology BeijingNo. 30 Xueyuan Road, Haidian DistrictBeijing100083China
| | - Shengyu Qin
- Peking UniversityNo. 5 Yiheyuan Road Haidian DistrictBeijing100871P. R. China
| | - Wei Hu
- University of Science and Technology BeijingNo. 30 Xueyuan Road, Haidian DistrictBeijing100083China
| | - Siquan Zhu
- Department of OphthalmologyBeijing Anzhen HospitalCapital Medical UniversityBeijing100029P. R. China
| | - Huai Yang
- Peking UniversityNo. 5 Yiheyuan Road Haidian DistrictBeijing100871P. R. China
| | - Dengke Yang
- Kent State University1425 Lefton EsplanadeKentOH44242USA
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12
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Hsu CC, Hsia FC, Weber B, de Rooij MB, Bonn D, Brouwer AM. Local Shearing Force Measurement during Frictional Sliding Using Fluorogenic Mechanophores. J Phys Chem Lett 2022; 13:8840-8844. [PMID: 36112048 PMCID: PMC9531245 DOI: 10.1021/acs.jpclett.2c02010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 09/13/2022] [Indexed: 06/15/2023]
Abstract
When two macroscopic objects touch, the real contact typically consists of multiple surface asperities that are deformed under the pressure that holds the objects together. Application of a shear force makes the objects slide along each other, breaking the initial contacts. To investigate how the microscopic shear force at the asperity level evolves during the transition from static to dynamic friction, we apply a fluorogenic mechanophore to visualize and quantify the local interfacial shear force. When a contact is broken, the shear force is released and the molecules return to their dark state, allowing us to dynamically observe the evolution of the shear force at the sliding contacts. We find that the macroscopic coefficient of friction describes the microscopic friction well, and that slip propagates from the edge toward the center of the macroscopic contact area before sliding occurs. This allows for a local understanding of how surfaces start to slide.
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Affiliation(s)
- Chao-Chun Hsu
- van’t
Hoff Institute for Molecular Sciences, University
of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Feng-Chun Hsia
- Advanced
Research Center for Nanolithography, Science Park 106, 1098 XG Amsterdam, The Netherlands
- van
der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Bart Weber
- Advanced
Research Center for Nanolithography, Science Park 106, 1098 XG Amsterdam, The Netherlands
- van
der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Matthijn B. de Rooij
- Laboratory
for Surface Technology and Tribology, Department of Engineering Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
| | - Daniel Bonn
- van
der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Albert M. Brouwer
- van’t
Hoff Institute for Molecular Sciences, University
of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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13
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Watabe T, Aoki D, Otsuka H. Polymer-Network Toughening and Highly Sensitive Mechanochromism via a Dynamic Covalent Mechanophore and a Multinetwork Strategy. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00724] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Takuma Watabe
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Daisuke Aoki
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Hideyuki Otsuka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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14
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Du M, Houck HA, Yin Q, Xu Y, Huang Y, Lan Y, Yang L, Du Prez FE, Chang G. Force-reversible chemical reaction at ambient temperature for designing toughened dynamic covalent polymer networks. Nat Commun 2022; 13:3231. [PMID: 35680925 PMCID: PMC9184613 DOI: 10.1038/s41467-022-30972-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 05/26/2022] [Indexed: 11/23/2022] Open
Abstract
Force-reversible C-N bonds, resulting from the click chemistry reaction between triazolinedione (TAD) and indole derivatives, offer exciting opportunities for molecular-level engineering to design materials that respond to mechanical loads. Here, we displayed that TAD-indole adducts, acting as crosslink points in dry-state covalently crosslinked polymers, enable materials to display reversible stress-responsiveness in real time already at ambient temperature. Whereas the exergonic TAD-indole reaction results in the formation of bench-stable adducts, they were shown to dissociate at ambient temperature when embedded in a polymer network and subjected to a stretching force to recover the original products. Moreover, the nascent TAD moiety can spontaneously and immediately be recombined after dissociation with an indole reaction partners at ambient temperature, thus allowing for the adjustment of the polymer segment conformation and the maintenance of the network integrity by force-reversible behaviors. Overall, our strategy represents a general method to create toughened covalently crosslinked polymer materials with simultaneous enhancement of mechanical strength and ductility, which is quite challenging to achieve by conventional chemical methods. Weak force-activated covalent bonds as crosslink points can increase mechanical strength and ductility in polymers but the bonds, once broken, cannot be reformed in real time under ambient conditions leading to irreversible damage. Here, the authors demonstrate that triazolinedione (TAD)-indole adducts acting as crosslink points enable materials to display already at ambient temperature reversible stress-responsiveness in real time.
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Affiliation(s)
- Mengqi Du
- State Key Laboratory of Environment-friendly Energy Materials & School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Hannes A Houck
- Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4-bis, B-9000, Ghent, Belgium
| | - Qiang Yin
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, 621900, P. R. China
| | - Yewei Xu
- State Key Laboratory of Environment-friendly Energy Materials & School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Ying Huang
- State Key Laboratory of Environment-friendly Energy Materials & School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, P. R. China
| | - Yang Lan
- Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, UK
| | - Li Yang
- State Key Laboratory of Environment-friendly Energy Materials & School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, P. R. China. .,Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA.
| | - Filip E Du Prez
- Polymer Chemistry Research Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4-bis, B-9000, Ghent, Belgium.
| | - Guanjun Chang
- State Key Laboratory of Environment-friendly Energy Materials & School of Materials and Chemistry, Southwest University of Science and Technology, Mianyang, 621010, P. R. China. .,Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, PA, 19104, USA.
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15
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Yamakado T, Saito S. Ratiometric Flapping Force Probe That Works in Polymer Gels. J Am Chem Soc 2022; 144:2804-2815. [PMID: 35108003 DOI: 10.1021/jacs.1c12955] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Polymer gels have recently attracted attention for their application in flexible devices, where mechanically robust gels are required. While there are many strategies to produce tough gels by suppressing nanoscale stress concentration on specific polymer chains, it is still challenging to directly verify the toughening mechanism at the molecular level. To solve this problem, the use of the flapping molecular force probe (FLAP) is promising because it can evaluate the nanoscale forces transmitted in the polymer chain network by ratiometric analysis of a stress-dependent dual fluorescence. A flexible conformational change of FLAP enables real-time and reversible responses to the nanoscale forces at the low force threshold, which is suitable for quantifying the percentage of the stressed polymer chains before structural damage. However, the previously reported FLAP only showed a negligible response in solvated environments because undesirable spontaneous planarization occurs in the excited state, even without mechanical force. Here, we have developed a new ratiometric force probe that functions in common organogels. Replacement of the anthraceneimide units in the flapping wings with pyreneimide units largely suppresses the excited-state planarization, leading to the force probe function under wet conditions. The FLAP-doped polyurethane organogel reversibly shows a dual-fluorescence response under sub-MPa compression. Moreover, the structurally modified FLAP is also advantageous in the wide dynamic range of its fluorescence response in solvent-free elastomers, enabling clearer ratiometric fluorescence imaging of the molecular-level stress concentration during crack growth in a stretched polyurethane film.
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Affiliation(s)
- Takuya Yamakado
- Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shohei Saito
- Graduate School of Science, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
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16
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Kotani R, Yokoyama S, Nobusue S, Yamaguchi S, Osuka A, Yabu H, Saito S. Bridging pico-to-nanonewtons with a ratiometric force probe for monitoring nanoscale polymer physics before damage. Nat Commun 2022; 13:303. [PMID: 35027559 PMCID: PMC8758707 DOI: 10.1038/s41467-022-27972-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2021] [Accepted: 12/15/2021] [Indexed: 02/07/2023] Open
Abstract
Understanding the transmission of nanoscale forces in the pico-to-nanonewton range is important in polymer physics. While physical approaches have limitations in analyzing the local force distribution in condensed environments, chemical analysis using force probes is promising. However, there are stringent requirements for probing the local forces generated before structural damage. The magnitude of those forces corresponds to the range below covalent bond scission (from 200 pN to several nN) and above thermal fluctuation (several pN). Here, we report a conformationally flexible dual-fluorescence force probe with a theoretically estimated threshold of approximately 100 pN. This probe enables ratiometric analysis of the distribution of local forces in a stretched polymer chain network. Without changing the intrinsic properties of the polymer, the force distribution was reversibly monitored in real time. Chemical control of the probe location demonstrated that the local stress concentration is twice as biased at crosslinkers than at main chains, particularly in a strain-hardening region. Due to the high sensitivity, the percentage of the stressed force probes was estimated to be more than 1000 times higher than the activation rate of a conventional mechanophore.
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Affiliation(s)
- Ryota Kotani
- Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Soichi Yokoyama
- Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Shunpei Nobusue
- Institute of Advanced Energy, Kyoto University, Uji, 611-0011, Japan
| | | | - Atsuhiro Osuka
- Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan
| | - Hiroshi Yabu
- WPI-Advanced Institute for Materials Research (AIMR), Tohoku University, Sendai, 980-8577, Japan.
| | - Shohei Saito
- Graduate School of Science, Kyoto University, Kyoto, 606-8502, Japan.
- PRESTO, Japan Science and Technology Agency, Kyoto, 606-8502, Japan.
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17
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Zeitler SM, Chakma P, Golder MR. Diaryliodonium Salts Facilitate Metal-Free Mechanoredox Free Radical Polymerizations. Chem Sci 2022; 13:4131-4138. [PMID: 35440983 PMCID: PMC8985515 DOI: 10.1039/d2sc00313a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 03/15/2022] [Indexed: 11/21/2022] Open
Abstract
Mechanically-induced redox processes offer a promising alternative to more conventional thermal and photochemical synthetic methods. For macromolecule synthesis, current methods utilize sensitive transition metal additives and suffer from background reactivity....
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Affiliation(s)
- Sarah M Zeitler
- Department of Chemistry, Molecular Engineering & Science Institute, University of Washington 36 Bagley Hall Seattle WA 98195 USA
| | - Progyateg Chakma
- Department of Chemistry, Molecular Engineering & Science Institute, University of Washington 36 Bagley Hall Seattle WA 98195 USA
| | - Matthew R Golder
- Department of Chemistry, Molecular Engineering & Science Institute, University of Washington 36 Bagley Hall Seattle WA 98195 USA
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18
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Cai W, Bullerjahn JT, Lallemang M, Kroy K, Balzer BN, Hugel T. Angle-dependent strength of a single chemical bond by stereographic force spectroscopy. Chem Sci 2022; 13:5734-5740. [PMID: 35694336 PMCID: PMC9117962 DOI: 10.1039/d2sc01077a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Accepted: 04/13/2022] [Indexed: 11/21/2022] Open
Abstract
A wealth of chemical bonds and polymers have been studied with single-molecule force spectroscopy, usually by applying a force perpendicular to the anchoring surface. However, the direction-dependence of the bond strength lacks fundamental understanding. Here we establish stereographic force spectroscopy to study the single-bond strength for various pulling angles. Surprisingly, we find that the apparent bond strength increases with increasing pulling angle relative to the anchoring surface normal, indicating a sturdy mechanical anisotropy of a chemical bond. This finding can be rationalized by a fixed pathway for the rupture of the bond, resulting in an effective projection of the applied pulling force onto a nearly fixed rupture direction. Our study is fundamental for the molecular understanding of the role of the direction of force application in molecular adhesion and friction. It is also a prerequisite for the nanoscale tailoring of the anisotropic strength of bottom-up designed materials. Stereographic force spectroscopy reveals that a chemical bond ruptures along a fixed pathway such that the apparent bond strength strongly depends on the angle of force application.![]()
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Affiliation(s)
- Wanhao Cai
- Institute of Physical Chemistry, University of Freiburg, Albertstr. 21, 79104, Freiburg, Germany
| | - Jakob T. Bullerjahn
- Department of Theoretical Biophysics, Max Planck Institute of Biophysics, Max-von-Laue-Straße 3, 60438, Frankfurt am Main, Germany
| | - Max Lallemang
- Institute of Physical Chemistry, University of Freiburg, Albertstr. 21, 79104, Freiburg, Germany
- Cluster of Excellence livMatS@FIT – Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, 79110, Freiburg, Germany
| | - Klaus Kroy
- Institute for Theoretical Physics, Leipzig University, Brüderstraße 16, 04103, Leipzig, Germany
| | - Bizan N. Balzer
- Institute of Physical Chemistry, University of Freiburg, Albertstr. 21, 79104, Freiburg, Germany
- Cluster of Excellence livMatS@FIT – Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, 79110, Freiburg, Germany
- Freiburg Materials Research Center (FMF), University of Freiburg, Stefan-Meier-Str. 21, 79104, Freiburg, Germany
| | - Thorsten Hugel
- Institute of Physical Chemistry, University of Freiburg, Albertstr. 21, 79104, Freiburg, Germany
- Cluster of Excellence livMatS@FIT – Freiburg Center for Interactive Materials and Bioinspired Technologies, University of Freiburg, Georges-Köhler-Allee 105, 79110, Freiburg, Germany
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19
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Kim D, Kwon MS, Lee CW. Mechanochromic polymers with a multimodal chromic transition: mechanophore design and transduction mechanism. Polym Chem 2022. [DOI: 10.1039/d2py00435f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review presents the recent progress in multi-chromic polymers embedded with mechanophores concentrating on transduction mechanisms and design concepts.
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Affiliation(s)
- Daewhan Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Min Sang Kwon
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Chung Whan Lee
- Department of Chemistry, Gachon University, Seongnam 13120, Republic of Korea
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20
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Küng R, Göstl R, Schmidt BM. Release of Molecular Cargo from Polymer Systems by Mechanochemistry. Chemistry 2021; 28:e202103860. [PMID: 34878679 PMCID: PMC9306765 DOI: 10.1002/chem.202103860] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Indexed: 11/15/2022]
Abstract
The design and manipulation of (multi)functional materials at the nanoscale holds the promise of fuelling tomorrow's major technological advances. In the realm of macromolecular nanosystems, the incorporation of force‐responsive groups, so called mechanophores, has resulted in unprecedented access to responsive behaviours and enabled sophisticated functions of the resulting structures and advanced materials. Among the diverse force‐activated motifs, the on‐demand release or activation of compounds, such as catalysts, drugs, or monomers for self‐healing, are sought‐after since they enable triggering pristine small molecule function from macromolecular frameworks. Here, we highlight examples of molecular cargo release systems from polymer‐based architectures in solution by means of sonochemical activation by ultrasound (ultrasound‐induced mechanochemistry). Important design concepts of these advanced materials are discussed, as well as their syntheses and applications.
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Affiliation(s)
- Robin Küng
- Heinrich-Heine-Univerität Düsseldorf, Department of Chemistry, GERMANY
| | - Robert Göstl
- DWI-Leibniz-Institut für Interaktive Materialien: DWI-Leibniz-Institut fur Interaktive Materialien, Department of Chemistry, GERMANY
| | - Bernd M Schmidt
- Heinrich-Heine-Universitat Dusseldorf, Institute of Organic Chemistry and Macromolecular Chemistry, Universitätsstraße 1, 26.33.U1.R38, 40225, Düsseldorf, GERMANY
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21
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Davis CS, Rencheck ML, Woodcock JW, Beams R, Wang M, Stranick S, Forster AM, Gilman JW. Activation of Mechanophores in a Thermoset Matrix by Instrumented Scratch. ACS APPLIED MATERIALS & INTERFACES 2021; 13:55498-55506. [PMID: 34780164 DOI: 10.1021/acsami.1c15004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Scratches in polymer coatings and barrier layers negatively impact optical properties (haze, light transmission, etc.), initiate routes of degradation or corrosion (moisture permeability), and nucleate delamination of the coating. Detecting scratches in coatings on advanced materials systems is an important component of structural health monitoring but can be difficult if the defects are too small to be detected by the naked eye. The primary focus of the present work is to investigate scratch damage using fluorescence lifetime imaging microscopy (FLIM) and mechanical activation of a mechanophore (MP)-containing transparent epoxy coating. The approach utilizes a Berkovich tip to scratch MP-epoxy coatings under a linearly increasing normal load. The goal is to utilize the fluorescent behavior of activated MPs to enable the detection of microscale scratches and molecular scale changes in polymeric systems. Taking advantage of the amine functionality present in a polyetheramine/bisphenol A epoxy network, a modified rhodamine dye is covalently bonded into a transparent, thermoset polymer network. Following instrumented scratch application, subsequent fluorescence imaging of the scratched MP-epoxy reveals the extent of fluorescence activation induced by the mechanical deformation. In this work, the rhodamine-based mechanophore is used to identify both ductile and fracture-dominated processes during the scratch application. The fluorescence intensity increases linearly with the applied normal load and is sensitive to fracture dominated processes. Fluorescence lifetime and hyperspectral imaging of damage zones provide additional insight into the local (nanoscopic) environment and molecular structure of the MP around the fracture process zone, respectively. The mechanophore/scratch deformation approach allows a fluorescence microscope to probe local yielding and fracture events in a powerful way that enhances the optical characterization of damage zones formed by standard scratch test methods and leads to novel defect detection strategies.
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Affiliation(s)
- Chelsea S Davis
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-3460, United States
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2045, United States
| | - Mitchell L Rencheck
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907-2045, United States
| | - Jeremiah W Woodcock
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-3460, United States
| | - Ryan Beams
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-3460, United States
| | - Muzhou Wang
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-3460, United States
| | - Stephan Stranick
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-3460, United States
| | - Aaron M Forster
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-3460, United States
| | - Jeffrey W Gilman
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-3460, United States
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22
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He S, Stratigaki M, Centeno SP, Dreuw A, Göstl R. Tailoring the Properties of Optical Force Probes for Polymer Mechanochemistry. Chemistry 2021; 27:15889-15897. [PMID: 34582082 PMCID: PMC9292383 DOI: 10.1002/chem.202102938] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Indexed: 02/05/2023]
Abstract
The correlation of mechanical properties of polymer materials with those of their molecular constituents is the foundation for their holistic comprehension and eventually for improved material designs and syntheses. Over the last decade, optical force probes (OFPs) were developed, shedding light on various unique mechanical behaviors of materials. The properties of polymers are diverse, ranging from soft hydrogels to ultra‐tough composites, from purely elastic rubbers to viscous colloidal solutions, and from transparent glasses to super black dyed coatings. Only very recently, researchers started to develop tailored OFP solutions that account for such material requirements in energy (both light and force), in time, and in their spatially detectable resolution. We here highlight notable recent examples and identify future challenges in this emergent field.
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Affiliation(s)
- Siyang He
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany.,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany
| | - Maria Stratigaki
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany
| | - Silvia P Centeno
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany
| | - Andreas Dreuw
- Interdisciplinary Center for Scientific Computing, Heidelberg University, Im Neuenheimer Feld 205, 69120, Heidelberg, Germany
| | - Robert Göstl
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056, Aachen, Germany
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23
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Goh R, Danielsen SPO, Schaible E, McMeeking RM, Waite JH. Nanolatticed Architecture Mitigates Damage in Shark Egg Cases. NANO LETTERS 2021; 21:8080-8085. [PMID: 34585939 DOI: 10.1021/acs.nanolett.1c02439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Structural versatility and multifunctionality of biological materials have resulted in countless bioinspired strategies seeking to emulate the properties of nature. The nanostructured egg case of swell sharks is one of the toughest permeable membranes known and, thus, presents itself as a model system for materials where the conflicting properties, strength and porosity, are desirable. The egg case possesses an intricately ordered structure that is designed to protect delicate embryos from the external environment while enabling respiratory and metabolic exchange, achieving a tactical balance between conflicting properties. Herein, structural analyses revealed an enabling nanolattice architecture that constitutes a Bouligand-like nanoribbon hierarchical assembly. Three distinct hierarchical architectural adaptations enhance egg case survival: Bouligand-like organization for in-plane isotropic reinforcement, noncylindrical nanoribbons maximizing interfacial stress distribution, and highly ordered nanolattices enabling permeability and lattice-governed toughening mechanisms. These discoveries provide fundamental insights for the improvement of multifunctional membranes, fiber-reinforced soft composites, and mechanical metamaterials.
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Affiliation(s)
- Rubayn Goh
- Materials Department, University of California, Santa Barbara, California 93106, United States
| | - Scott P O Danielsen
- Thomas Lord Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, United States
| | - Eric Schaible
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Robert M McMeeking
- Mechanical Engineering Department, University of California, Santa Barbara, California 93106, United States
| | - J Herbert Waite
- Department of Molecular, Cellular, and Developmental Biology, University of California, Santa Barbara, California 93106, United States
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24
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Noh J, Peterson GI, Choi T. Mechanochemical Reactivity of Bottlebrush and Dendronized Polymers: Solid vs. Solution States. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104447] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Jinkyung Noh
- Department of Chemistry Seoul National University Seoul 08826 Republic of Korea
| | - Gregory I. Peterson
- Department of Chemistry Incheon National University 119 Academy-ro, Yeonsu-gu Incheon 22012 Republic of Korea
| | - Tae‐Lim Choi
- Department of Chemistry Seoul National University Seoul 08826 Republic of Korea
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25
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Noh J, Peterson GI, Choi TL. Mechanochemical Reactivity of Bottlebrush and Dendronized Polymers: Solid vs. Solution States. Angew Chem Int Ed Engl 2021; 60:18651-18659. [PMID: 34101320 DOI: 10.1002/anie.202104447] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/22/2021] [Indexed: 12/23/2022]
Abstract
We explored the mechanochemical degradation of bottlebrush and dendronized polymers in solution (with ultrasonication, US) and solid states (with ball-mill grinding, BMG). Over 50 polymers were prepared with varying backbone length and arm architecture, composition, and size. With US, we found that bottlebrush and dendronized polymers exhibited consistent backbone scission behavior, which was related to their elongated conformations in solution. Considerably different behavior was observed with BMG, as arm architecture and composition had a significant impact on backbone scission rates. Arm scission was also observed for bottlebrush polymers in both solution and solid states, but only in the solid state for dendronized polymers. Motivated by these results, multi-mechanophore polymers with bottlebrush and dendronized polymer architectures were prepared and their reactivity was compared. Although dendronized polymers showed slower arm-scission, the selectivity for mechanophore activation was much higher. Overall, these results have important implications to the development of new mechanoresponsive materials.
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Affiliation(s)
- Jinkyung Noh
- Department of Chemistry, Seoul National University, Seoul, 08826, Republic of Korea
| | - Gregory I Peterson
- Department of Chemistry, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea
| | - Tae-Lim Choi
- Department of Chemistry, Seoul National University, Seoul, 08826, Republic of Korea
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26
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Peterson GI, Choi TL. The influence of polymer architecture in polymer mechanochemistry. Chem Commun (Camb) 2021; 57:6465-6474. [PMID: 34132272 DOI: 10.1039/d1cc02501e] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Polymer architecture is an important factor in polymer mechanochemistry. In this Feature Article, we summarize recent developments in utilizing polymer architecture to modulate mechanochemical reactions within polymers, or more specifically, the location and rates of bond scission events that lead to polymer fragmentation or mechanophore activation. Various well-defined architectures have been explored, including those of cyclic, intramolecularly cross-linked, dendritic, star, bottlebrush, and dendronized polymers. We primarily focus on describing the enhancement or suppression of mechanochemical reactivity, with respect to analogous linear polymers, as well as differences in solution- and solid-state behavior.
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Affiliation(s)
- Gregory I Peterson
- Department of Chemistry, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon 22012, Republic of Korea.
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27
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Zhao P, Huo S, Fan J, Chen J, Kiessling F, Boersma AJ, Göstl R, Herrmann A. Activation of the Catalytic Activity of Thrombin for Fibrin Formation by Ultrasound. Angew Chem Int Ed Engl 2021; 60:14707-14714. [PMID: 33939872 PMCID: PMC8252103 DOI: 10.1002/anie.202105404] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Indexed: 12/11/2022]
Abstract
The regulation of enzyme activity is a method to control biological function. We report two systems enabling the ultrasound-induced activation of thrombin, which is vital for secondary hemostasis. First, we designed polyaptamers, which can specifically bind to thrombin, inhibiting its catalytic activity. With ultrasound generating inertial cavitation and therapeutic medical focused ultrasound, the interactions between polyaptamer and enzyme are cleaved, restoring the activity to catalyze the conversion of fibrinogen into fibrin. Second, we used split aptamers conjugated to the surface of gold nanoparticles (AuNPs). In the presence of thrombin, these assemble into an aptamer tertiary structure, induce AuNP aggregation, and deactivate the enzyme. By ultrasonication, the AuNP aggregates reversibly disassemble releasing and activating the enzyme. We envision that this approach will be a blueprint to control the function of other proteins by mechanical stimuli in the sonogenetics field.
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Affiliation(s)
- Pengkun Zhao
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstr. 5052056AachenGermany
| | - Shuaidong Huo
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstr. 5052056AachenGermany
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 152074AachenGermany
- Fujian Provincial Key Laboratory of Innovative Drug Target ResearchSchool of Pharmaceutical ScienceXiamen University361102XiamenChina
| | - Jilin Fan
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstr. 5052056AachenGermany
| | - Junlin Chen
- Institute for Experimental Molecular ImagingUniversity Hospital AachenForckenbeckstr. 5552074AachenGermany
| | - Fabian Kiessling
- Institute for Experimental Molecular ImagingUniversity Hospital AachenForckenbeckstr. 5552074AachenGermany
| | - Arnold J. Boersma
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstr. 5052056AachenGermany
| | - Robert Göstl
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstr. 5052056AachenGermany
| | - Andreas Herrmann
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstr. 5052056AachenGermany
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 152074AachenGermany
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28
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Zhao P, Huo S, Fan J, Chen J, Kiessling F, Boersma AJ, Göstl R, Herrmann A. Aktivierung der katalytischen Aktivität von Thrombin für die Bildung von Fibrin durch Ultraschall. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Pengkun Zhao
- Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen Niederlande
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstr. 50 52056 Aachen Deutschland
| | - Shuaidong Huo
- Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen Niederlande
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstr. 50 52056 Aachen Deutschland
- Institut für Technische und Makromolekulare Chemie RWTH Aachen Worringerweg 1 52074 Aachen Deutschland
- Fujian Provincial Key Laboratory of Innovative Drug Target Research School of Pharmaceutical Science Xiamen University 361102 Xiamen China
| | - Jilin Fan
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstr. 50 52056 Aachen Deutschland
| | - Junlin Chen
- Institut für Experimentelle Molekulare Bildgebung Uniklinik Aachen Forckenbeckstr. 55 52074 Aachen Deutschland
| | - Fabian Kiessling
- Institut für Experimentelle Molekulare Bildgebung Uniklinik Aachen Forckenbeckstr. 55 52074 Aachen Deutschland
| | - Arnold J. Boersma
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstr. 50 52056 Aachen Deutschland
| | - Robert Göstl
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstr. 50 52056 Aachen Deutschland
| | - Andreas Herrmann
- Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen Niederlande
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstr. 50 52056 Aachen Deutschland
- Institut für Technische und Makromolekulare Chemie RWTH Aachen Worringerweg 1 52074 Aachen Deutschland
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29
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Sammon MS, Biewend M, Michael P, Schirra S, Ončák M, Binder WH, Beyer MK. Activation of a Copper Biscarbene Mechano-Catalyst Using Single-Molecule Force Spectroscopy Supported by Quantum Chemical Calculations. Chemistry 2021; 27:8723-8729. [PMID: 33822419 PMCID: PMC8251802 DOI: 10.1002/chem.202100555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Indexed: 11/17/2022]
Abstract
Single-molecule force spectroscopy allows investigation of the effect of mechanical force on individual bonds. By determining the forces necessary to sufficiently activate bonds to trigger dissociation, it is possible to predict the behavior of mechanophores. The force necessary to activate a copper biscarbene mechano-catalyst intended for self-healing materials was measured. By using a safety line bypassing the mechanophore, it was possible to pinpoint the dissociation of the investigated bond and determine rupture forces to range from 1.6 to 2.6 nN at room temperature in dimethyl sulfoxide. The average length-increase upon rupture of the Cu-C bond, due to the stretching of the safety line, agrees with quantum chemical calculations, but the values exhibit an unusual scattering. This scattering was assigned to the conformational flexibility of the mechanophore, which includes formation of a threaded structure and recoiling of the safety line.
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Affiliation(s)
- Matthew S. Sammon
- Institut für Ionenphysik und Angewandte PhysikUniversität InnsbruckTechnikerstraße 256020InnsbruckAustria
| | - Michel Biewend
- Department of Macromolecular ChemistryMartin-Luther-Universität Halle-Wittenbergvon-Danckelmann-Platz 406120Halle (Saale)Germany
| | - Philipp Michael
- Department of Macromolecular ChemistryMartin-Luther-Universität Halle-Wittenbergvon-Danckelmann-Platz 406120Halle (Saale)Germany
| | - Simone Schirra
- Institut für Ionenphysik und Angewandte PhysikUniversität InnsbruckTechnikerstraße 256020InnsbruckAustria
| | - Milan Ončák
- Institut für Ionenphysik und Angewandte PhysikUniversität InnsbruckTechnikerstraße 256020InnsbruckAustria
| | - Wolfgang H. Binder
- Department of Macromolecular ChemistryMartin-Luther-Universität Halle-Wittenbergvon-Danckelmann-Platz 406120Halle (Saale)Germany
| | - Martin K. Beyer
- Institut für Ionenphysik und Angewandte PhysikUniversität InnsbruckTechnikerstraße 256020InnsbruckAustria
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30
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Küng R, Pausch T, Rasch D, Göstl R, Schmidt BM. Mechanochemische Freisetzung nichtkovalent gebundener Gäste aus einem mit Polymerketten dekorierten supramolekularen Käfig. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102383] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Robin Küng
- Institut für Organische Chemie und Makromolekulare Chemie Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1 40225 Düsseldorf Deutschland
| | - Tobias Pausch
- Institut für Organische Chemie und Makromolekulare Chemie Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1 40225 Düsseldorf Deutschland
| | - Dustin Rasch
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstraße 50 52056 Aachen Deutschland
- Institut für Technische und Makromolekulare Chemie RWTH Aachen University Worringerweg 1 52074 Aachen Deutschland
| | - Robert Göstl
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstraße 50 52056 Aachen Deutschland
| | - Bernd M. Schmidt
- Institut für Organische Chemie und Makromolekulare Chemie Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1 40225 Düsseldorf Deutschland
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31
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Küng R, Pausch T, Rasch D, Göstl R, Schmidt BM. Mechanochemical Release of Non-Covalently Bound Guests from a Polymer-Decorated Supramolecular Cage. Angew Chem Int Ed Engl 2021; 60:13626-13630. [PMID: 33729649 PMCID: PMC8251918 DOI: 10.1002/anie.202102383] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 03/08/2021] [Indexed: 12/21/2022]
Abstract
Supramolecular coordination cages show a wide range of useful properties including, but not limited to, complex molecular machine-like operations, confined space catalysis, and rich host-guest chemistries. Here we report the uptake and release of non-covalently encapsulated, pharmaceutically-active cargo from an octahedral Pd cage bearing polymer chains on each vertex. Six poly(ethylene glycol)-decorated bipyridine ligands are used to assemble an octahedral PdII6 (TPT)4 cage. The supramolecular container encapsulates progesterone and ibuprofen within its hydrophobic nanocavity and is activated by shear force produced by ultrasonication in aqueous solution entailing complete cargo release upon rupture, as shown by NMR and GPC analyses.
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Affiliation(s)
- Robin Küng
- Institut für Organische Chemie und Makromolekulare ChemieHeinrich-Heine-Universität DüsseldorfUniversitätsstrasse 140225DüsseldorfGermany
| | - Tobias Pausch
- Institut für Organische Chemie und Makromolekulare ChemieHeinrich-Heine-Universität DüsseldorfUniversitätsstrasse 140225DüsseldorfGermany
| | - Dustin Rasch
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstrasse 5052056AachenGermany
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 152074AachenGermany
| | - Robert Göstl
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstrasse 5052056AachenGermany
| | - Bernd M. Schmidt
- Institut für Organische Chemie und Makromolekulare ChemieHeinrich-Heine-Universität DüsseldorfUniversitätsstrasse 140225DüsseldorfGermany
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32
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Bettens T, Eeckhoudt J, Hoffmann M, Alonso M, Geerlings P, Dreuw A, De Proft F. Designing Force Probes Based on Reversible 6π-Electrocyclizations in Polyenes Using Quantum Chemical Calculations. J Org Chem 2021; 86:7477-7489. [PMID: 33988028 DOI: 10.1021/acs.joc.1c00482] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The conjugated π-system in polyenes can be interrupted by electrocyclic ring-closure reactions. In this work, this 6π-electrocylization is shown by means of density functional calculations to be reversible by the application of an external mechanical pulling force at the terminal ends of the interrupted polyene chain. The test systems were constrained in a fused ring system, thus locking the orientation of three π-bonds and generally promoting 6π-electrocyclic ring-closure reactions. For several systems, the forward reaction is exergonic and the corresponding reaction barrier is comparable to those reported in the literature. The reverse reaction is triggered by an external pulling force of 2 nN (nano-Newton) or less and also becomes exergonic in all investigated polyenes under these force conditions. Moreover, it proceeds via a low reaction barrier when a pulling force of 2 nN is active, indicating that the mechanical force is an efficient stimulus for triggering ring-opening reactions. Analysis of the strain energy induced by this mechanical force confirms an optimal activation of the corresponding C-C σ-bond that breaks upon ring opening when the pulling positions are located on the polyene chain.
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Affiliation(s)
- Tom Bettens
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium
| | - Jochen Eeckhoudt
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium
| | - Marvin Hoffmann
- Interdisciplinary Center for Scientific Computing, Ruprecht-Karls University, Im Neuenheimer Feld 205A, D-69120 Heidelberg, Germany
| | - Mercedes Alonso
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium
| | - Paul Geerlings
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium
| | - Andreas Dreuw
- Interdisciplinary Center for Scientific Computing, Ruprecht-Karls University, Im Neuenheimer Feld 205A, D-69120 Heidelberg, Germany
| | - Frank De Proft
- Eenheid Algemene Chemie (ALGC), Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium
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33
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Peterson GI, Noh J, Ha MY, Yang S, Lee WB, Choi TL. Influence of Grafting Density on Ultrasound-Induced Backbone and Arm Scission of Graft Copolymers. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00334] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Gregory I. Peterson
- Department of Chemistry, Incheon National University, 119 Academy-ro,
Yeonsu-gu, Incheon 22012, Republic of Korea
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Jinkyung Noh
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Min Young Ha
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Sanghee Yang
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
| | - Won Bo Lee
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Tae-Lim Choi
- Department of Chemistry, Seoul National University, Seoul 08826, Republic of Korea
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34
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Danielsen SPO, Beech HK, Wang S, El-Zaatari BM, Wang X, Sapir L, Ouchi T, Wang Z, Johnson PN, Hu Y, Lundberg DJ, Stoychev G, Craig SL, Johnson JA, Kalow JA, Olsen BD, Rubinstein M. Molecular Characterization of Polymer Networks. Chem Rev 2021; 121:5042-5092. [PMID: 33792299 DOI: 10.1021/acs.chemrev.0c01304] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Polymer networks are complex systems consisting of molecular components. Whereas the properties of the individual components are typically well understood by most chemists, translating that chemical insight into polymer networks themselves is limited by the statistical and poorly defined nature of network structures. As a result, it is challenging, if not currently impossible, to extrapolate from the molecular behavior of components to the full range of performance and properties of the entire polymer network. Polymer networks therefore present an unrealized, important, and interdisciplinary opportunity to exert molecular-level, chemical control on material macroscopic properties. A barrier to sophisticated molecular approaches to polymer networks is that the techniques for characterizing the molecular structure of networks are often unfamiliar to many scientists. Here, we present a critical overview of the current characterization techniques available to understand the relation between the molecular properties and the resulting performance and behavior of polymer networks, in the absence of added fillers. We highlight the methods available to characterize the chemistry and molecular-level properties of individual polymer strands and junctions, the gelation process by which strands form networks, the structure of the resulting network, and the dynamics and mechanics of the final material. The purpose is not to serve as a detailed manual for conducting these measurements but rather to unify the underlying principles, point out remaining challenges, and provide a concise overview by which chemists can plan characterization strategies that suit their research objectives. Because polymer networks cannot often be sufficiently characterized with a single method, strategic combinations of multiple techniques are typically required for their molecular characterization.
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Affiliation(s)
- Scott P O Danielsen
- Marsico Lung Institute, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Haley K Beech
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Shu Wang
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Bassil M El-Zaatari
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Xiaodi Wang
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | | | | | - Zi Wang
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Patricia N Johnson
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Yixin Hu
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - David J Lundberg
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Georgi Stoychev
- Marsico Lung Institute, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Stephen L Craig
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Jeremiah A Johnson
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Julia A Kalow
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Bradley D Olsen
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Michael Rubinstein
- Marsico Lung Institute, University of North Carolina, Chapel Hill, North Carolina 27599, United States.,Department of Chemistry, Duke University, Durham, North Carolina 27708, United States.,Departments of Biomedical Engineering and Physics, Duke University, Durham, North Carolina 27708, United States.,World Primer Institute for Chemical Reaction Design and Discovery (WPI-ICReDD), Hokkaido University, Kita 21 Nishi 10, Kita-ku, Sapporo, Hokkaido 001-0021, Japan
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35
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Qian H, Purwanto NS, Ivanoff DG, Halmes AJ, Sottos NR, Moore JS. Fast, reversible mechanochromism of regioisomeric oxazine mechanophores: Developing in situ responsive force probes for polymeric materials. Chem 2021. [DOI: 10.1016/j.chempr.2021.02.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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36
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Watabe T, Aoki D, Otsuka H. Enhancement of Mechanophore Activation in Mechanochromic Dendrimers by Functionalization of Their Surface. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02497] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Takuma Watabe
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Daisuke Aoki
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Hideyuki Otsuka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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37
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Huo S, Zhao P, Shi Z, Zou M, Yang X, Warszawik E, Loznik M, Göstl R, Herrmann A. Mechanochemical bond scission for the activation of drugs. Nat Chem 2021; 13:131-139. [PMID: 33514936 DOI: 10.1038/s41557-020-00624-8] [Citation(s) in RCA: 128] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 12/10/2020] [Indexed: 01/30/2023]
Abstract
Pharmaceutical drug therapy is often hindered by issues caused by poor drug selectivity, including unwanted side effects and drug resistance. Spatial and temporal control over drug activation in response to stimuli is a promising strategy to attenuate and circumvent these problems. Here we use ultrasound to activate drugs from inactive macromolecules or nano-assemblies through the controlled scission of mechanochemically labile covalent bonds and weak non-covalent bonds. We show that a polymer with a disulfide motif at the centre of the main chain releases an alkaloid-based anticancer drug from its β-carbonate linker by a force-induced intramolecular 5-exo-trig cyclization. Second, aminoglycoside antibiotics complexed by a multi-aptamer RNA structure are activated by the mechanochemical opening and scission of the nucleic acid backbone. Lastly, nanoparticle-polymer and nanoparticle-nanoparticle assemblies held together by hydrogen bonds between the peptide antibiotic vancomycin and its complementary peptide target are activated by force-induced scission of hydrogen bonds. This work demonstrates the potential of ultrasound to activate mechanoresponsive prodrug systems.
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Affiliation(s)
- Shuaidong Huo
- Fujian Provincial Key Laboratory of Innovative Drug Target Research, School of Pharmaceutical Science, Xiamen University, Xiamen, China.,DWI - Leibniz Institute for Interactive Materials, Aachen, Germany.,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen, Germany.,Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Pengkun Zhao
- DWI - Leibniz Institute for Interactive Materials, Aachen, Germany.,Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Zhiyuan Shi
- DWI - Leibniz Institute for Interactive Materials, Aachen, Germany.,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen, Germany
| | - Miancheng Zou
- DWI - Leibniz Institute for Interactive Materials, Aachen, Germany.,Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Xintong Yang
- DWI - Leibniz Institute for Interactive Materials, Aachen, Germany.,Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Eliza Warszawik
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
| | - Mark Loznik
- DWI - Leibniz Institute for Interactive Materials, Aachen, Germany.,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen, Germany
| | - Robert Göstl
- DWI - Leibniz Institute for Interactive Materials, Aachen, Germany.
| | - Andreas Herrmann
- DWI - Leibniz Institute for Interactive Materials, Aachen, Germany. .,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Aachen, Germany. .,Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands.
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38
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Zhou Y, Huo S, Loznik M, Göstl R, Boersma AJ, Herrmann A. Kontrolle über die optische und katalytische Aktivität gentechnisch hergestellter Proteine mit Ultraschall. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202010324] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Yu Zhou
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstraße 50 52056 Aachen Deutschland
- Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen Niederlande
| | - Shuaidong Huo
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstraße 50 52056 Aachen Deutschland
- Institut für Technische Chemie und Makromolekulare Chemie RWTH Aachen Worringerweg 1 52074 Aachen Deutschland
- Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen Niederlande
- Fujian Provincial Key Laboratory of Innovative Drug Target Research School of Pharmaceutical Science Xiamen University 361102 Xiamen China
| | - Mark Loznik
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstraße 50 52056 Aachen Deutschland
- Institut für Technische Chemie und Makromolekulare Chemie RWTH Aachen Worringerweg 1 52074 Aachen Deutschland
| | - Robert Göstl
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstraße 50 52056 Aachen Deutschland
| | - Arnold J. Boersma
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstraße 50 52056 Aachen Deutschland
| | - Andreas Herrmann
- DWI – Leibniz-Institut für Interaktive Materialien Forckenbeckstraße 50 52056 Aachen Deutschland
- Institut für Technische Chemie und Makromolekulare Chemie RWTH Aachen Worringerweg 1 52074 Aachen Deutschland
- Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen Niederlande
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39
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Zhou Y, Huo S, Loznik M, Göstl R, Boersma AJ, Herrmann A. Controlling Optical and Catalytic Activity of Genetically Engineered Proteins by Ultrasound. Angew Chem Int Ed Engl 2021; 60:1493-1497. [PMID: 33104261 PMCID: PMC7839785 DOI: 10.1002/anie.202010324] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 09/23/2020] [Indexed: 12/31/2022]
Abstract
Ultrasound (US) produces cavitation-induced mechanical forces stretching and breaking polymer chains in solution. This type of polymer mechanochemistry is widely used for synthetic polymers, but not biomacromolecules, even though US is biocompatible and commonly used for medical therapy as well as in vivo imaging. The ability to control protein activity by US would thus be a major stepping-stone for these disciplines. Here, we provide the first examples of selective protein activation and deactivation by means of US. Using GFP as a model system, we engineer US sensitivity into proteins by design. The incorporation of long and highly charged domains enables the efficient transfer of force to the protein structure. We then use this principle to activate the catalytic activity of trypsin by inducing the release of its inhibitor. We expect that this concept to switch "on" and "off" protein activity by US will serve as a blueprint to remotely control other bioactive molecules.
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Affiliation(s)
- Yu Zhou
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstrasse 5052056AachenGermany
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
| | - Shuaidong Huo
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstrasse 5052056AachenGermany
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 152074AachenGermany
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
- Fujian Provincial Key Laboratory of Innovative Drug Target ResearchSchool of Pharmaceutical ScienceXiamen University361102XiamenChina
| | - Mark Loznik
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstrasse 5052056AachenGermany
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 152074AachenGermany
| | - Robert Göstl
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstrasse 5052056AachenGermany
| | - Arnold J. Boersma
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstrasse 5052056AachenGermany
| | - Andreas Herrmann
- DWI—Leibniz Institute for Interactive MaterialsForckenbeckstrasse 5052056AachenGermany
- Institute of Technical and Macromolecular ChemistryRWTH Aachen UniversityWorringerweg 152074AachenGermany
- Zernike Institute for Advanced MaterialsUniversity of GroningenNijenborgh 49747 AGGroningenThe Netherlands
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40
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Chen Y, Mellot G, van Luijk D, Creton C, Sijbesma RP. Mechanochemical tools for polymer materials. Chem Soc Rev 2021; 50:4100-4140. [DOI: 10.1039/d0cs00940g] [Citation(s) in RCA: 112] [Impact Index Per Article: 37.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This review aims to provide a field guide for the implementation of mechanochemistry in synthetic polymers by summarizing the molecules, materials, and methods that have been developed in this field.
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Affiliation(s)
- Yinjun Chen
- Department of Chemical Engineering & Chemistry and Institute for Complex Molecular Systems
- Eindhoven University of Technology
- 5600 MB Eindhoven
- The Netherlands
| | - Gaëlle Mellot
- Laboratoire Sciences et Ingénierie de la Matière Molle
- ESPCI Paris
- PSL University
- Sorbonne Université
- CNRS
| | - Diederik van Luijk
- Department of Chemical Engineering & Chemistry and Institute for Complex Molecular Systems
- Eindhoven University of Technology
- 5600 MB Eindhoven
- The Netherlands
| | - Costantino Creton
- Laboratoire Sciences et Ingénierie de la Matière Molle
- ESPCI Paris
- PSL University
- Sorbonne Université
- CNRS
| | - Rint P. Sijbesma
- Department of Chemical Engineering & Chemistry and Institute for Complex Molecular Systems
- Eindhoven University of Technology
- 5600 MB Eindhoven
- The Netherlands
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41
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Shi Z, Song Q, Göstl R, Herrmann A. Mechanochemical activation of disulfide-based multifunctional polymers for theranostic drug release. Chem Sci 2020; 12:1668-1674. [PMID: 34163927 PMCID: PMC8179261 DOI: 10.1039/d0sc06054b] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Drug delivery systems responsive to physicochemical stimuli allow spatiotemporal control over drug activity to overcome limitations of systemic drug administration. Alongside, the non-invasive real-time tracking of drug release and uptake remains challenging as pharmacophore and reporter function are rarely unified within one molecule. Here, we present an ultrasound-responsive release system based on the mechanochemically induced 5-exo-trig cyclization upon scission of disulfides bearing cargo molecules attached via β-carbonate linker within the center of a water soluble polymer. In this bifunctional theranostic approach, we release one reporter molecule per drug molecule to quantitatively track drug release and distribution within the cell in real-time. We use N-butyl-4-hydroxy-1,8-naphthalimide and umbelliferone as fluorescent reporter molecules to accompany the release of camptothecin and gemcitabine as clinically employed anticancer agents. The generality of this approach paves the way for the theranostic release of a variety of probes and drugs by ultrasound. A theranostic approach for the mechanochemically induced release of drugs is presented to track drug release and uptake in real-time.![]()
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Affiliation(s)
- Zhiyuan Shi
- DWI - Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany .,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University Worringerweg 1 52074 Aachen Germany
| | - Qingchuan Song
- DWI - Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany .,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University Worringerweg 1 52074 Aachen Germany
| | - Robert Göstl
- DWI - Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany
| | - Andreas Herrmann
- DWI - Leibniz Institute for Interactive Materials Forckenbeckstr. 50 52056 Aachen Germany .,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University Worringerweg 1 52074 Aachen Germany.,Zernike Institute for Advanced Materials, University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands
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42
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Wu M, Guo Z, He W, Yuan W, Chen Y. Empowering self-reporting polymer blends with orthogonal optical properties responsive in a broader force range. Chem Sci 2020; 12:1245-1250. [PMID: 34163886 PMCID: PMC8179123 DOI: 10.1039/d0sc06140a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Self-reporting polymers, which can indicate damage with perceptible optical signals in a tailored force range, are useful as stress-sensitive sensors. We demonstrate a simple approach to realize this function by embedding two distinct mechanophores - rhodamine (Rh) and bis(adamantyl)-1,2-dioxetane (Ad), in polyurethane/polylactic acid blends. The deformed blends generate red coloration and red chemiluminescence. Such a unique dual-responsive behavior was evaluated by solid-state UV-vis spectroscopy, macroscopic tensile tests with in situ RGB and light intensity analyses, which supported a stress-correlated occurrence of the ring-opening of Rh, the scission of Ad and the fluorescence resonance energy transfer process between the respective mechanochemical species. Complementarity stemming from the difference in properties and manifestations of the two mechanophores is essential. That is, the more labile Rh allows shifting the appreciable optical changes to a much lower force threshold; the transient nature and high dynamic range of mechanochemiluminescence from Ad map in real time where and when many of the covalently incorporated dioxetane bonds break; besides, the disrupted yet non-scissile structure of Rh acts as a fluorescent acceptor to effectively harvest chemiluminescence from ruptured Ad. The current strategy is thus empowering multi-functional mechano-responsive polymers with greatly improved sensitivity and resolution for multimodal stress reporting.
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Affiliation(s)
- Mengjiao Wu
- Department of Chemistry, Key Laboratory of Mechanism Theory and Equipment Design of State Ministry of Education, Tianjin University Tianjin 300354 China
| | - Zhen Guo
- Department of Chemistry, Key Laboratory of Mechanism Theory and Equipment Design of State Ministry of Education, Tianjin University Tianjin 300354 China
| | - Weiye He
- Department of Chemistry, Key Laboratory of Mechanism Theory and Equipment Design of State Ministry of Education, Tianjin University Tianjin 300354 China
| | - Wei Yuan
- Department of Chemistry, Key Laboratory of Mechanism Theory and Equipment Design of State Ministry of Education, Tianjin University Tianjin 300354 China
| | - Yulan Chen
- Department of Chemistry, Key Laboratory of Mechanism Theory and Equipment Design of State Ministry of Education, Tianjin University Tianjin 300354 China
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43
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Tian Y, Cao X, Li X, Zhang H, Sun CL, Xu Y, Weng W, Zhang W, Boulatov R. A Polymer with Mechanochemically Active Hidden Length. J Am Chem Soc 2020; 142:18687-18697. [PMID: 33064473 PMCID: PMC7596784 DOI: 10.1021/jacs.0c09220] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Incorporating hidden length into polymer chains can improve their mechanical properties, because release of the hidden length under mechanical loads enables localized strain relief without chain fracture. To date, the design of hidden length has focused primarily on the choice of the sacrificial bonds holding the hidden length together. Here we demonstrate the advantages of adding mechanochemical reactivity to hidden length itself, using a new mechanophore that integrates (Z)-2,3-diphenylcyclobutene-1,4-dicarboxylate, with hitherto unknown mechanochemistry, into macrocyclic cinnamate dimers. Stretching a polymer of this mechanophore more than doubles the chain contour length without fracture. DFT calculations indicate that the sequential dissociation of the dimer, followed by cyclobutene isomerization at higher forces yields a chain fracture energy 11 times that of a simple polyester of the same initial contour length and preserves high energy-dissipating capacity up to ∼3 nN. In sonicated solutions cyclobutene isomerizes to two distinct products by competing reaction paths, validating the computed mechanochemical mechanism and suggesting an experimental approach to quantifying the distribution of single-chain forces under diverse loading scenarios.
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Affiliation(s)
- Yancong Tian
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
| | - Xiaodong Cao
- Department of Chemistry, College of Chemistry and Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Xun Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin 130012, People's Republic of China
| | - Huan Zhang
- Department of Chemistry, College of Chemistry and Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Cai-Li Sun
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
| | - Yuanze Xu
- Department of Chemistry, College of Chemistry and Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Wengui Weng
- Department of Chemistry, College of Chemistry and Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Wenke Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, Jilin 130012, People's Republic of China
| | - Roman Boulatov
- Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K
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44
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Shi Z, Wu J, Song Q, Göstl R, Herrmann A. Toward Drug Release Using Polymer Mechanochemical Disulfide Scission. J Am Chem Soc 2020; 142:14725-14732. [PMID: 32804498 DOI: 10.1021/jacs.0c07077] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Traditional pharmacotherapy suffers from multiple drawbacks that hamper patient treatment, such as the buildup of antibiotic resistances or low drug selectivity and toxicity during systemic application. To overcome these challenges, drug activity can be controlled by employing delivery, targeting, or release solutions that mostly rely on the response to external physicochemical stimuli. Due to various technical limitations, mechanical force as a stimulus in the context of polymer mechanochemistry has so far not been used for this purpose, yet it has been proven to be a convenient and robust method to site-selectively rearrange or cleave bonds with submolecular precision in the realm of materials chemistry. Here, we present an unprecedented mechanochemically responsive system capable of successively releasing small furan-containing molecules, including the furylated fluorophore dansyl and the drugs furosemide as well as furylated doxorubicin, by ultrasound-induced selective scission of disulfide-centered polymers in solution. We show that mechanochemically generated thiol-terminated polymers undergo a Michael-type addition to Diels-Alder (DA) adducts of furylated drugs and acetylenedicarboxylate derivatives, initiating the downstream release of the small molecule drug by a retro DA reaction. We believe that this method can serve as a blueprint for the activation of many other small molecules.
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Affiliation(s)
- Zhiyuan Shi
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056 Aachen, Germany.,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany
| | - Jingnan Wu
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056 Aachen, Germany.,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany
| | - Qingchuan Song
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056 Aachen, Germany.,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany
| | - Robert Göstl
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056 Aachen, Germany
| | - Andreas Herrmann
- DWI - Leibniz Institute for Interactive Materials, Forckenbeckstr. 50, 52056 Aachen, Germany.,Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany.,Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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45
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Yang J, Horst M, Werby SH, Cegelski L, Burns NZ, Xia Y. Bicyclohexene- peri-naphthalenes: Scalable Synthesis, Diverse Functionalization, Efficient Polymerization, and Facile Mechanoactivation of Their Polymers. J Am Chem Soc 2020; 142:14619-14626. [PMID: 32786795 DOI: 10.1021/jacs.0c06454] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pursuing polymers that can transform from a nonconjugated to a conjugated state under mechanical stress to significantly change their properties, we developed a new generation of ladder-type mechanophore monomers, bicyclo[2.2.0]hex-5-ene-peri-naphthalene (BCH-Naph), that can be directly and efficiently polymerized by ring-opening metathesis polymerization (ROMP). BCH-Naphs can be synthesized in multigram quantities and functionalized with a wide range of electron-rich and electron-poor substituents, allowing tuning of the optoelectronic and physical properties of mechanically generated conjugated polymers. Efficient ROMP of BCH-Naphs yielded ultrahigh molecular weight polymechanophores with controlled MWs and low dispersity. The resulting poly(BCH-Naph)s can be mechanically activated into conjugated polymers using ultrasonication, grinding, and even simple stirring of the dilute solutions, leading to changes in absorption and fluorescence. Poly(BCH-Naph)s represent an attractive polymechanophore system to explore multifaceted mechanical response in solution and solid states, owing to the synthetic scalability, functional diversity, efficient polymerization, and facile mechanoactivation.
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Affiliation(s)
- Jinghui Yang
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Matias Horst
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Sabrina H Werby
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Lynette Cegelski
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Noah Z Burns
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Yan Xia
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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46
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47
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Deneke N, Rencheck ML, Davis CS. An engineer's introduction to mechanophores. SOFT MATTER 2020; 16:6230-6252. [PMID: 32567642 DOI: 10.1039/d0sm00465k] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Mechanophores (MPs) are a class of stimuli-responsive materials that are of increasing interest to engineers due to their potential applications as stress sensors. These mechanically responsive molecules change color or become fluorescent upon application of a mechanical stimulus as they undergo a chemical reaction when a load is applied. By incorporating MPs such as spirolactam, spiropyran, or dianthracene into a material system, the real-time stress distribution of the matrix can be directly observed through a visual response, ideal for damage and failure sensing applications. A wide array of applications that require continuous structural health monitoring could benefit from MPs including flexible electronics, protective coatings, and polymer matrix composites. However, there are significant technical challenges preventing MP implementation in industry. Effective strategies to quantitatively calibrate the photo response of the MP with applied stress magnitudes must be developed. Additionally, environmental conditions, including temperature, humidity, and ultraviolet light exposure can potentially impact the performance of MPs. By addressing these limitations, engineers can work to move MPs from the synthetic chemistry bench to the field. This review aims to highlight recent progress in MP research, discuss barriers to implementation, and provide an outlook on the future of MPs, specifically focused on polymeric material systems. Although the focus is on engineering MPs for bulk materials, a brief overview of mechanochemistry will be discussed followed by methods for activation and quantification of MP photo response (concentrating specifically on fluorescently active species). Finally, current challenges and future directions in MP research will be addressed.
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Affiliation(s)
- Naomi Deneke
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47906, USA.
| | - Mitchell L Rencheck
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47906, USA.
| | - Chelsea S Davis
- School of Materials Engineering, Purdue University, West Lafayette, Indiana 47906, USA.
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48
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Torelli M, Terenziani F, Pedrini A, Guagnini F, Domenichelli I, Massera C, Dalcanale E. Mechanically-Driven Vase-Kite Conformational Switch in Cavitand Cross-Linked Polyurethanes. ChemistryOpen 2020; 9:261-268. [PMID: 32128296 PMCID: PMC7043258 DOI: 10.1002/open.201900345] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/29/2020] [Indexed: 12/20/2022] Open
Abstract
The eligibility of tetraquinoxaline cavitands (QxCav) as molecular grippers relies on their unique conformational mobility between a closed (vase) and an open (kite) form, triggered in solution by conventional stimuli like pH, temperature and ion concentration. In the present paper, the mechanochemical conformational switching of ad hoc functionalized QxCav covalently embedded in an elastomeric polydimethylsiloxane and in a more rigid polyurethane matrix is investigated. The rigid polymer matrix is more effective in converting mechanical force into a conformational switch at the molecular level, provided that all four quinoxaline wings are covalently connected to the polymer.
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Affiliation(s)
- Martina Torelli
- Department of Chemistry, Life Sciences and Environmental Sustainability and INSTM UdR ParmaUniversity of ParmaParco Area delle Scienze 17/AParma43124Italy
| | - Francesca Terenziani
- Department of Chemistry, Life Sciences and Environmental Sustainability and INSTM UdR ParmaUniversity of ParmaParco Area delle Scienze 17/AParma43124Italy
| | - Alessandro Pedrini
- Department of Chemistry, Life Sciences and Environmental Sustainability and INSTM UdR ParmaUniversity of ParmaParco Area delle Scienze 17/AParma43124Italy
| | - Francesca Guagnini
- Department of Chemistry, Life Sciences and Environmental Sustainability and INSTM UdR ParmaUniversity of ParmaParco Area delle Scienze 17/AParma43124Italy
| | - Ilaria Domenichelli
- Department of Chemistry, Life Sciences and Environmental Sustainability and INSTM UdR ParmaUniversity of ParmaParco Area delle Scienze 17/AParma43124Italy
| | - Chiara Massera
- Department of Chemistry, Life Sciences and Environmental Sustainability and INSTM UdR ParmaUniversity of ParmaParco Area delle Scienze 17/AParma43124Italy
| | - Enrico Dalcanale
- Department of Chemistry, Life Sciences and Environmental Sustainability and INSTM UdR ParmaUniversity of ParmaParco Area delle Scienze 17/AParma43124Italy
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49
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Izak-Nau E, Campagna D, Baumann C, Göstl R. Polymer mechanochemistry-enabled pericyclic reactions. Polym Chem 2020. [DOI: 10.1039/c9py01937e] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Polymer mechanochemical pericyclic reactions are reviewed with regard to their structural features and substitution prerequisites to the polymer framework.
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Affiliation(s)
- Emilia Izak-Nau
- DWI – Leibniz Institute for Interactive Materials
- 52056 Aachen
- Germany
| | - Davide Campagna
- DWI – Leibniz Institute for Interactive Materials
- 52056 Aachen
- Germany
- Institute for Technical and Macromolecular Chemistry
- RWTH Aachen University
| | - Christoph Baumann
- DWI – Leibniz Institute for Interactive Materials
- 52056 Aachen
- Germany
- Institute for Technical and Macromolecular Chemistry
- RWTH Aachen University
| | - Robert Göstl
- DWI – Leibniz Institute for Interactive Materials
- 52056 Aachen
- Germany
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50
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Affiliation(s)
- Elizabeth R. Gillies
- Department of Chemistry, Department of Chemical and Biochemical Engineering, Centre for Advanced Materials and Biomaterials Research, TheUniversity of Western Ontario London, ON Canada N6A 5B7
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