1
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Yang C, Wu XT, Yu L, Bi CA, Du FS, Li ZC. Photochemical [2 + 2] Cycloaddition Enables the Synthesis of Highly Thermally Stable and Acid/Base-Resistant Polyesters from a Nonpolymerizable α,β-Conjugated Valerolactone. ACS Macro Lett 2024:1084-1092. [PMID: 39103245 DOI: 10.1021/acsmacrolett.4c00398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/07/2024]
Abstract
We report a simple strategy to transform a nonpolymerizable six-membered α,β-conjugated lactone, 5,6-dihydro-2H-pyran-2-one (DPO), into polymerizable bicyclic lactones via photochemical [2 + 2] cycloaddition. Two bicyclic lactones, M1 and M2, were obtained by the photochemical [2 + 2] cycloaddition of tetramethylethylene and DPO. Ring-opening polymerization (ROP) of M1 and M2 catalyzed by diphenyl phosphate (DPP), La[N(SiMe3)2]3, and 1-tert-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris (dimethylamino) phosphoranylide-namino]-2λ5, 4λ5-catenadi(phosphazene) (tBu-P4) were conducted. M1 is highly polymerizable, either DPP or La[N(SiMe3)2]3 could catalyze its living ROP under mild conditions, affording the well-defined PM1 with a predictable molar mass and low dispersity. M2 could only be polymerized with tBu-P4 as the catalyst, also generating the same polymer PM1. PM1 has high thermal stability, with a Td,5% being up to 376 °C. Ring-opening copolymerization (ROcP) of M1 and δ-valerolactone (δ-VL) catalyzed by La[N(SiMe3)2]3 afforded a series of random copolymers with enhanced thermal stabilities. Both PM1 and the copolymer containing 10 mol % M1 exhibited excellent resistance to acidic and basic hydrolysis. Our results demonstrate that direct photochemical [2 + 2] cycloaddition of α,β-conjugated valerolactone is not only a strategy to tune its polymerizability, but also allows for the synthesis of highly thermally stable aliphatic polyesters, inaccessible by other methods.
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Affiliation(s)
- Chun Yang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Centre for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Xiao-Tong Wu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Centre for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Lefei Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Centre for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Cheng-Ao Bi
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Centre for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Fu-Sheng Du
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Centre for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
| | - Zi-Chen Li
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Department of Polymer Science and Engineering, College of Chemistry and Molecular Engineering, Centre for Soft Matter Science and Engineering, Peking University, Beijing 100871, China
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2
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Meyersohn M, Haque FM, Hillmyer MA. Dynamic Aliphatic Polyester Elastomers Crosslinked with Aliphatic Dianhydrides. ACS POLYMERS AU 2023; 3:365-375. [PMID: 37841953 PMCID: PMC10571103 DOI: 10.1021/acspolymersau.3c00004] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 04/14/2023] [Accepted: 04/17/2023] [Indexed: 10/17/2023]
Abstract
Chemically crosslinked elastomers are a class of polymeric materials with properties that render them useful as adhesives, sealants, and in other engineering applications. Poly(γ-methyl-ε-caprolactone) (PγMCL) is a hydrolytically degradable and compostable aliphatic polyester that can be biosourced and exhibits competitive mechanical properties to traditional elastomers when chemically crosslinked. A typical limitation of chemically crosslinked elastomers is that they cannot be reprocessed; however, the incorporation of dynamic covalent bonds can allow for bonds to reversibly break and reform under an external stimulus, usually heat. In this work, we study the dynamic behavior and mechanical properties of PγMCL elastomers synthesized from aliphatic dianhydride crosslinkers. The crosslinked elastomers in this work were synthesized using the commercially available crosslinkers, 1,2,4,5-cyclohexanetetracarboxylic dianhydride, and 1,2,3,4-cyclobutanetetracarboxylic dianhydride and three-arm hydroxy-telechelic PγMCL star polymers. Stress relaxation experiments on the crosslinked networks showed an Arrhenius dependence of viscosity with temperature with an activation energy of 118 ± 8 kJ/mol, which agrees well with the activation energy of transesterification exchange chemistry obtained from small molecule model studies. Dynamic mechanical thermal analysis and rheological experiments confirmed the dynamic nature of the networks and provided insight into the mechanism of exchange (i.e., associative or dissociative). Tensile testing showed that these materials can exhibit high strains at break and low Young's moduli, characteristic of soft and strong elastomers. By controlling the exchange chemistry and understanding the effect of macromolecular structure on mechanical properties, we prepared the high-performance elastomers that can be potentially reprocessed at moderately elevated temperatures.
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Affiliation(s)
- Marianne
S. Meyersohn
- Department of Chemistry, University
of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Farihah M. Haque
- Department of Chemistry, University
of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Marc A. Hillmyer
- Department of Chemistry, University
of Minnesota, Minneapolis, Minnesota 55455, United States
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3
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Filippova OV, Maksimkin AV, Dayyoub T, Larionov DI, Telyshev DV. Sustainable Elastomers for Actuators: "Green" Synthetic Approaches and Material Properties. Polymers (Basel) 2023; 15:2755. [PMID: 37376401 DOI: 10.3390/polym15122755] [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: 05/30/2023] [Revised: 06/09/2023] [Accepted: 06/16/2023] [Indexed: 06/29/2023] Open
Abstract
Elastomeric materials have great application potential in actuator design and soft robot development. The most common elastomers used for these purposes are polyurethanes, silicones, and acrylic elastomers due to their outstanding physical, mechanical, and electrical properties. Currently, these types of polymers are produced by traditional synthetic methods, which may be harmful to the environment and hazardous to human health. The development of new synthetic routes using green chemistry principles is an important step to reduce the ecological footprint and create more sustainable biocompatible materials. Another promising trend is the synthesis of other types of elastomers from renewable bioresources, such as terpenes, lignin, chitin, various bio-oils, etc. The aim of this review is to address existing approaches to the synthesis of elastomers using "green" chemistry methods, compare the properties of sustainable elastomers with the properties of materials produced by traditional methods, and analyze the feasibility of said sustainable elastomers for the development of actuators. Finally, the advantages and challenges of existing "green" methods of elastomer synthesis will be summarized, along with an estimation of future development prospects.
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Affiliation(s)
- Olga V Filippova
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University (Sechenov University), Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
| | - Aleksey V Maksimkin
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University (Sechenov University), Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
| | - Tarek Dayyoub
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University (Sechenov University), Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
- Department of Physical Chemistry, National University of Science and Technology "MISIS", 119049 Moscow, Russia
| | - Dmitry I Larionov
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University (Sechenov University), Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
| | - Dmitry V Telyshev
- Institute for Bionic Technologies and Engineering, I.M. Sechenov First Moscow State Medical University (Sechenov University), Bolshaya Pirogovskaya Street 2-4, 119991 Moscow, Russia
- Institute of Biomedical Systems, National Research University of Electronic Technology, Zelenograd, 124498 Moscow, Russia
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4
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Nakagawa S, Aoki D, Asano Y, Yoshie N. Module-Assembled Elastomer Showing Large Strain Stiffening Capability and High Stretchability. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2301124. [PMID: 36929528 DOI: 10.1002/adma.202301124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 03/07/2023] [Indexed: 06/09/2023]
Abstract
Elastomers are indispensable materials due to their flexible, stretchable, and elastic nature. However, the polymer network structure constituting an elastomer is generally inhomogeneous, limiting the performance of the material. Here, a highly stretchable elastomer with unprecedented strain-stiffening capability is developed based on a highly homogeneous network structure enabled by a module assembly strategy. The elastomer is synthesized by efficient end-linking of a star-shaped aliphatic polyester precursor with a narrow molecular-weight distribution. The resulting product shows high strength (≈26 MPa) and remarkable stretchability (stretch ratio at break ≈1900%), as well as good fatigue resistance and notch insensitivity. Moreover, it shows extraordinary strain-stiffening capability (>2000-fold increase in the apparent stiffness) that exceeds the performance of any existing soft material. These unique properties are due to strain-induced ordering of the polymer chains in a uniformly stretched network, as revealed by in situ X-ray scattering analyses. The utility of this great strain-stiffening capability is demonstrated by realizing a simple variable stiffness actuator for soft robotics.
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Affiliation(s)
- Shintaro Nakagawa
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan
| | - Daisuke Aoki
- Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
| | - Yuki Asano
- Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Naoko Yoshie
- Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, 153-8505, Japan
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5
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Palenzuela M, Sarisuta K, Navarro M, Kumamoto N, Chanthaset N, Monot J, Ajiro H, Martín-Vaca B, Bourissou D. 5-Methylene-1,3-dioxane-2-one: A First-Choice Comonomer for Trimethylene Carbonate. Macromolecules 2023. [DOI: 10.1021/acs.macromol.2c02270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Miguel Palenzuela
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), CNRS, Université de Toulouse (UPS), 118 route de Narbonne, F-31062 Toulouse, France
| | - Kamolchanok Sarisuta
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), CNRS, Université de Toulouse (UPS), 118 route de Narbonne, F-31062 Toulouse, France
- Graduate School of Materials Science and Data Science Center, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Marta Navarro
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), CNRS, Université de Toulouse (UPS), 118 route de Narbonne, F-31062 Toulouse, France
| | - Narumi Kumamoto
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), CNRS, Université de Toulouse (UPS), 118 route de Narbonne, F-31062 Toulouse, France
- Graduate School of Materials Science and Data Science Center, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Nalinthip Chanthaset
- Graduate School of Materials Science and Data Science Center, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Julien Monot
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), CNRS, Université de Toulouse (UPS), 118 route de Narbonne, F-31062 Toulouse, France
| | - Hiroharu Ajiro
- Graduate School of Materials Science and Data Science Center, Nara Institute of Science and Technology, Ikoma, Nara 630-0192, Japan
| | - Blanca Martín-Vaca
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), CNRS, Université de Toulouse (UPS), 118 route de Narbonne, F-31062 Toulouse, France
| | - Didier Bourissou
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), CNRS, Université de Toulouse (UPS), 118 route de Narbonne, F-31062 Toulouse, France
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6
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Nakornkhet C, Nanok T, Wattanathana W, Chuawong P, Hormnirun P. Titanium Complexes of Salicylbenzoxazole and Salicylbenzothiazole Ligands for the Ring-Opening Polymerization of ε-Caprolactone and Substituted ε-Caprolactones and Their Copolymerizations. Inorg Chem 2022; 61:7945-7963. [PMID: 35537466 DOI: 10.1021/acs.inorgchem.2c00577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Two series of titanium complexes, including salicylbenzoxazole titanium complexes (1-4) and salicylbenzothiazole titanium complexes (5-8), were successfully synthesized and characterized by NMR spectroscopy, elemental analysis, and X-ray diffraction crystallography (for 2 and 5). The 1H NMR spectra of complexes 7 and 8 reveal fluxional behavior in solution at room temperature, and the activation parameters were determined by lineshape analysis of variable-temperature (VT) NMR spectra in toluene-d8: for 7, ΔH⧧ = 73.0 ± 1.8 kJ mol-1, ΔS⧧ = 22.1 ± 5.5 J mol-1 K-1; for 8, ΔH⧧ = 73.7 ± 1.2 kJ mol-1, ΔS⧧ = 20.3 ± 3.8 J mol-1 K-1. The positive values of ΔS⧧ suggested that the isomerization occurred via a dissociative mechanism. All complexes were active initiators for the ring-opening polymerization of ε-caprolactone (ε-CL) and three substituted ε-CLs: γ-methyl-ε-caprolactone (γMeCL), γ-ethyl-ε-caprolactone (γEtCL), and γ-phenyl-ε-caprolactone (γPhCL). Of all complexes, complex 5 was found to be the most active initiator in this study. The copolymerizations between ε-CL and three substituted ε-CLs produced completely random copolymers. The polymerization was proposed to proceed via a dissociative coordination-insertion mechanism. The catalytic activity of the salicylbenzoxazole titanium complex was lower than that of its closely related salicylbenzothiazole titanium congener. Additionally, DFT calculations unveiled that the ligand decoordination step and the less steric congestion at the titanium center in the salicylbenzothiazole titanium complexes were the key factors in enhancing the catalytic rate.
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Affiliation(s)
- Chutikan Nakornkhet
- Laboratory of Catalysts and Advanced Polymer Materials, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Tanin Nanok
- Laboratory of Catalysts and Advanced Polymer Materials, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.,Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, Kasetsart University, Bangkok 10900, Thailand
| | - Worawat Wattanathana
- Department of Materials Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand
| | - Pitak Chuawong
- Laboratory of Catalysts and Advanced Polymer Materials, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand
| | - Pimpa Hormnirun
- Laboratory of Catalysts and Advanced Polymer Materials, Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand.,Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, Kasetsart University, Bangkok 10900, Thailand
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7
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Petersen SR, Prydderch H, Worch JC, Stubbs CJ, Wang Z, Yu J, Arno MC, Dobrynin AV, Becker ML, Dove AP. Ultra-Tough Elastomers from Stereochemistry-Directed Hydrogen Bonding in Isosorbide-Based Polymers. Angew Chem Int Ed Engl 2022; 61:e202115904. [PMID: 35167725 PMCID: PMC9311410 DOI: 10.1002/anie.202115904] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Indexed: 02/02/2023]
Abstract
The remarkable elasticity and tensile strength found in natural elastomers are challenging to mimic. Synthetic elastomers typically feature covalently cross-linked networks (rubbers), but this hinders their reprocessability. Physical cross-linking via hydrogen bonding or ordered crystallite domains can afford reprocessable elastomers, but often at the cost of performance. Herein, we report the synthesis of ultra-tough, reprocessable elastomers based on linear alternating polymers. The incorporation of a rigid isohexide adjacent to urethane moieties affords elastomers with exceptional strain hardening, strain rate dependent behavior, and high optical clarity. Distinct differences were observed between isomannide and isosorbide-based elastomers where the latter displays superior tensile strength and strain recovery. These phenomena are attributed to the regiochemical irregularities in the polymers arising from their distinct stereochemistry and respective inter-chain hydrogen bonding.
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Affiliation(s)
- Shannon R Petersen
- Department of Polymer Science, The University of Akron, Akron, OH 44224, USA
| | - Hannah Prydderch
- School of Chemistry, University of Birmingham, Birmingham, B15 2TT, UK
| | - Joshua C Worch
- School of Chemistry, University of Birmingham, Birmingham, B15 2TT, UK
| | - Connor J Stubbs
- School of Chemistry, University of Birmingham, Birmingham, B15 2TT, UK
| | - Zilu Wang
- Department of Chemistry, University of North Carolina Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Jiayi Yu
- Department of Polymer Science, The University of Akron, Akron, OH 44224, USA
| | - Maria C Arno
- School of Chemistry, University of Birmingham, Birmingham, B15 2TT, UK
| | - Andrey V Dobrynin
- Department of Chemistry, University of North Carolina Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Matthew L Becker
- Department of Chemistry, Mechanical Engineering and Materials Science, Biomedical Engineering and Orthopedic Surgery, Duke University, Durham, NC, 20899, USA
| | - Andrew P Dove
- School of Chemistry, University of Birmingham, Birmingham, B15 2TT, UK
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8
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Chinomso Iroegbu A, Ray SS. Lignin and Keratin-Based Materials in Transient Devices and Disposables: Recent Advances Toward Materials and Environmental Sustainability. ACS OMEGA 2022; 7:10854-10863. [PMID: 35415330 PMCID: PMC8991899 DOI: 10.1021/acsomega.1c07372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/07/2022] [Indexed: 05/08/2023]
Abstract
Rising concerns and the associated negative implications of pollution from e-waste and delayed decomposition and mineralization of component materials (e.g., plastics) are significant environmental challenges. Hence, concerted pursuit of accurate and efficient control of the life cycle of materials and subsequent dematerialization in target environments has become essential in recent times. The emerging field of transient technology will play a significant role in this regard to help overcome current environmental challenges by enabling the use of novel approaches and new materials with unique functionalities to produce devices and materials such as disposable diagnostic devices, flexible solar panels, and foldable displays that are more ecologically benign, low-cost, and sustainable. The prerequisites for materials employed in transient devices and disposables include biodegradability, biocompatibility, and the inherent ability to mineralize or dissipate in target environments (e.g., body fluids) in a short lifetime with net-zero impact. Biomaterials such as lignin and keratin are well-known to be among the most promising environmentally benign, functional, sustainable, and industrially applicable resources for transient devices and disposables. Consequently, considering the current environmental concerns, this work focuses on the advances in applying lignin and keratin-based materials in short-life electronics and single-use consumables, current limitations, future research outlook toward materials, and environmental sustainability.
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Affiliation(s)
- Austine
Ofondu Chinomso Iroegbu
- Department
of Chemical Sciences, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa
- Centre
for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre, Council for Scientific
& Industrial Research, Pretoria 0001, South Africa
| | - Suprakas Sinha Ray
- Department
of Chemical Sciences, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa
- Centre
for Nanostructures and Advanced Materials, DSI-CSIR Nanotechnology Innovation Centre, Council for Scientific
& Industrial Research, Pretoria 0001, South Africa
- ,
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9
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Kaluzynski K, Pretula J, Lewinski P, Kaźmierski S, Penczek S. Synthesis and Properties of Functionalized Poly(ε-caprolactone); Chain Polymerization Followed by Polycondensation in One Pot with Initiator and Catalyst in One Molecule. Synthesis and Molecular Structures. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krzysztof Kaluzynski
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Julia Pretula
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Piotr Lewinski
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Sławomir Kaźmierski
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Stanislaw Penczek
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
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10
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Petersen SR, Prydderch H, Worch JC, Stubbs CJ, Wang Z, Yu J, Arno MC, Dobrynin AV, Becker ML, Dove AP. Ultra‐Tough Elastomers from Stereochemistry‐Directed Hydrogen Bonding in Isosorbide‐Based Polymers. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202115904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Hannah Prydderch
- School of Chemistry University of Birmingham Birmingham B15 2TT UK
| | - Joshua C. Worch
- School of Chemistry University of Birmingham Birmingham B15 2TT UK
| | - Connor J. Stubbs
- School of Chemistry University of Birmingham Birmingham B15 2TT UK
| | - Zilu Wang
- Department of Chemistry University of North Carolina Chapel Hill Chapel Hill NC, 27599 USA
| | - Jiayi Yu
- Department of Polymer Science The University of Akron Akron OH 44224 USA
| | - Maria C. Arno
- School of Chemistry University of Birmingham Birmingham B15 2TT UK
| | - Andrey V. Dobrynin
- Department of Chemistry University of North Carolina Chapel Hill Chapel Hill NC, 27599 USA
| | - Matthew L. Becker
- Department of Chemistry, Mechanical Engineering and Materials Science Biomedical Engineering and Orthopedic Surgery Duke University Durham NC, 20899 USA
| | - Andrew P. Dove
- School of Chemistry University of Birmingham Birmingham B15 2TT UK
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11
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Gregory GL, Williams CK. Exploiting Sodium Coordination in Alternating Monomer Sequences to Toughen Degradable Block Polyester Thermoplastic Elastomers. Macromolecules 2022; 55:2290-2299. [PMID: 35558439 PMCID: PMC9084597 DOI: 10.1021/acs.macromol.2c00068] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 02/14/2022] [Indexed: 01/26/2023]
Abstract
![]()
Thermoplastic
elastomers (TPEs) that are closed-loop recyclable
are needed in a circular material economy, but many current materials
degrade during recycling, and almost all are pervasive hydrocarbons.
Here, well-controlled block polyester TPEs featuring regularly placed
sodium/lithium carboxylate side chains are described. They show significantly
higher tensile strengths than unfunctionalized analogues, with high
elasticity and elastic recovery. The materials are prepared using
controlled polymerizations, exploiting a single catalyst that switches
between different polymerization cycles. ABA block polyesters of high
molar mass (60–100 kg mol–1; 21 wt % A-block)
are constructed using the ring-opening polymerization of ε-decalactone
(derived from castor oil; B-block), followed by the alternating ring-opening
copolymerization of phthalic anhydride with 4-vinyl-cyclohexene oxide
(A-blocks). The polyesters undergo efficient functionalization to
install regularly placed carboxylic acids onto the A blocks. Reacting
the polymers with sodium or lithium hydroxide controls the extent
of ionization (0–100%); ionized polymers show a higher tensile
strength (20 MPa), elasticity (>2000%), and elastic recovery (>80%).
In one case, sodium functionalization results in 35× higher stress
at break than the carboxylic acid polymer; in all cases, changing
the quantity of sodium tunes the properties. A leading sample, 2-COONa75 (Mn 100 kg mol–1, 75% sodium), shows a wide operating temperature range (−52
to 129 °C) and is recycled (×3) by hot-pressing at 200 °C,
without the loss of mechanical properties. Both the efficient synthesis
of ABA block polymers and precision ionization in perfectly alternating
monomer sequences are concepts that can be generalized to many other
monomers, functional groups, and metals. These materials are partly
bioderived and have degradable ester backbone chemistries, deliver
useful properties, and allow for thermal reprocessing; these features
are attractive as future sustainable TPEs.
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Affiliation(s)
- Georgina L. Gregory
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Charlotte K. Williams
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
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12
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Haque FM, Ishibashi JSA, Lidston CAL, Shao H, Bates FS, Chang AB, Coates GW, Cramer CJ, Dauenhauer PJ, Dichtel WR, Ellison CJ, Gormong EA, Hamachi LS, Hoye TR, Jin M, Kalow JA, Kim HJ, Kumar G, LaSalle CJ, Liffland S, Lipinski BM, Pang Y, Parveen R, Peng X, Popowski Y, Prebihalo EA, Reddi Y, Reineke TM, Sheppard DT, Swartz JL, Tolman WB, Vlaisavljevich B, Wissinger J, Xu S, Hillmyer MA. Defining the Macromolecules of Tomorrow through Synergistic Sustainable Polymer Research. Chem Rev 2022; 122:6322-6373. [PMID: 35133803 DOI: 10.1021/acs.chemrev.1c00173] [Citation(s) in RCA: 49] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Transforming how plastics are made, unmade, and remade through innovative research and diverse partnerships that together foster environmental stewardship is critically important to a sustainable future. Designing, preparing, and implementing polymers derived from renewable resources for a wide range of advanced applications that promote future economic development, energy efficiency, and environmental sustainability are all central to these efforts. In this Chemical Reviews contribution, we take a comprehensive, integrated approach to summarize important and impactful contributions to this broad research arena. The Review highlights signature accomplishments across a broad research portfolio and is organized into four wide-ranging research themes that address the topic in a comprehensive manner: Feedstocks, Polymerization Processes and Techniques, Intended Use, and End of Use. We emphasize those successes that benefitted from collaborative engagements across disciplinary lines.
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Affiliation(s)
- Farihah M Haque
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Jacob S A Ishibashi
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Claire A L Lidston
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1801, United States
| | - Huiling Shao
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Frank S Bates
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Alice B Chang
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Geoffrey W Coates
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1801, United States
| | - Christopher J Cramer
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Paul J Dauenhauer
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - William R Dichtel
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Christopher J Ellison
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Ethan A Gormong
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Leslie S Hamachi
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Thomas R Hoye
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Mengyuan Jin
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Julia A Kalow
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Hee Joong Kim
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Gaurav Kumar
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Christopher J LaSalle
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Stephanie Liffland
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Bryce M Lipinski
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1801, United States
| | - Yutong Pang
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Riffat Parveen
- Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States
| | - Xiayu Peng
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Yanay Popowski
- Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130-4899, United States
| | - Emily A Prebihalo
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Yernaidu Reddi
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Theresa M Reineke
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Daylan T Sheppard
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Jeremy L Swartz
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - William B Tolman
- Department of Chemistry, Washington University in St. Louis, St. Louis, Missouri 63130-4899, United States
| | - Bess Vlaisavljevich
- Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States
| | - Jane Wissinger
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Shu Xu
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Marc A Hillmyer
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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Fournier L, Rivera Mirabal DM, Hillmyer MA. Toward Sustainable Elastomers from the Grafting-Through Polymerization of Lactone-Containing Polyester Macromonomers. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02349] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Lucie Fournier
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | | | - Marc A. Hillmyer
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
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14
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Lewinski P, Kaluzynski K, Pretula J, Mielniczak G, Penczek S. Catalysis in polymerization of cyclic esters. Catalyst and initiator in one molecule. Polymerization of lactide. J Catal 2022. [DOI: 10.1016/j.jcat.2021.11.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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KAYSER F, Fleury G, thongkham S, Navarro C, Martin-Vaca B, Bourissou D. Reducing the crystallinity of PCL chains by copolymerization with substituted δ/ε-lactones and its impact on the phase separation of PCL-based block copolymers. Polym Chem 2022. [DOI: 10.1039/d2py00101b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Various substituted δ/ε-lactones have been copolymerized with ε-caprolactone (ε-CL) with the aim to inhibit the crystallization of polycaprolactone (PCL). Among the studied co-monomers, the best results were obtained with the...
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16
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Panja S, Siehr A, Sahoo A, Siegel RA, Shen W. Biodegradable Elastomers Enabling Thermoprocessing Below 100 °C. Biomacromolecules 2021; 23:163-173. [PMID: 34898190 DOI: 10.1021/acs.biomac.1c01197] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Biodegradable and biocompatible elastomers are highly desirable for many biomedical applications. Here, we report synthesis and characterization of poly(ε-caprolactone)-co-poly(β-methyl-δ-valerolactone)-co-poly(ε-caprolactone) (PCL-PβMδVL-PCL) elastomers. These materials have strain to failure values greater than 1000%. Tensile set measurements according to an ASTM standard revealed a 98.24% strain recovery 10 min after the force was removed and complete strain recovery 40 min after the force was removed. The PβMδVL midblock is amorphous with a glass-transition temperature of -51 °C, and PCL end blocks are semicrystalline and have a melting temperature in the range of 52-55 °C. Due to their thermoplastic nature and the low melting temperature, these elastomers can be readily processed by printing, extrusion, or hot-pressing at 60 °C. Lysozyme, a model bioactive agent, was incorporated into a PCL-PβMδVL-PCL elastomer through melt blending in an extruder, and the blend was further hot-pressed into films; both processing steps were performed at 60 °C. No loss of lysozyme bioactivity was observed. PCL-PβMδVL-PCL elastomers are as cytocompatible as tissue culture polystyrene in supporting cell viability and cell growth, and they are degradable in aqueous environments through hydrolysis. The degradable, cytocompatible, elastomeric, and thermoplastic properties of PCL-PβMδVL-PCL polymers collectively render them potentially valuable for many applications in the biomedical field, such as medical devices and tissue engineering scaffolds.
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Affiliation(s)
- Sudipta Panja
- Department of Biomedical Engineering, University of Minnesota, 312 Church St. SE, 7-105 Nils Hasselmo Hall, Minneapolis, Minnesota 55455, United States
| | - Allison Siehr
- Department of Biomedical Engineering, University of Minnesota, 312 Church St. SE, 7-105 Nils Hasselmo Hall, Minneapolis, Minnesota 55455, United States
| | - Anasuya Sahoo
- Department of Pharmaceutics, University of Minnesota, 308 SE Harvard St, Room 9-177 Weaver Densford Hall, Minneapolis, Minnesota 55455, United States
| | - Ronald A Siegel
- Department of Biomedical Engineering, University of Minnesota, 312 Church St. SE, 7-105 Nils Hasselmo Hall, Minneapolis, Minnesota 55455, United States.,Department of Pharmaceutics, University of Minnesota, 308 SE Harvard St, Room 9-177 Weaver Densford Hall, Minneapolis, Minnesota 55455, United States
| | - Wei Shen
- Department of Biomedical Engineering, University of Minnesota, 312 Church St. SE, 7-105 Nils Hasselmo Hall, Minneapolis, Minnesota 55455, United States
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17
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Penczek S, Pretula J. Activated Monomer Mechanism (AMM) in Cationic Ring-Opening Polymerization. The Origin of the AMM and Further Development in Polymerization of Cyclic Esters. ACS Macro Lett 2021; 10:1377-1397. [PMID: 35549023 DOI: 10.1021/acsmacrolett.1c00509] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The origin of the activated monomer mechanism (AMM) in cationic ring-opening polymerization (CROP) is described first. Then, conditions leading to the active chain end (ACE) mechanism and AMM are compared, as well as methods allowing to distinguish between these two mechanisms. These methods are based on the "ion trapping" of the active ionic species using highly basic phosphines or by comparing ACE and AMM kinetics of polymerization. The major factors deciding on the actual mechanism include: basicity of the monomers, ring strain, and the presence of the protic additives in the reaction system. These factors are tabulated for major cyclic ethers and cyclic esters. The historically evolved subsequent steps of AMM in the polymerization of cyclic esters are described: from the first experiments with trialkyloxonium salts, precursors of protonic acids, and added alcohols, via HCl as catalyst, and then CF3S(═O)2OH (polymerizing lactides) to the most popular derivatives of phosphoric acid, like diphenyl phosphate. Conditions allowing to synthesize poly(ε-caprolactone) (PCL), according to AMM-CROP, with molar mass up to 105 g·mol-1, are described as well as methods to polymerize CL with a protic initiator and acidic catalyst in one molecule. Then various methods enhancing the activity of the polymerizing systems are compared, based predominantly on hydrogen bonding, either to the polymer active end group (usually the hydroxyl group) or to the acid anion. Finally, kinetic equations for ACE and AMM are compared, and it is shown that the majority of the AMM-CROP systems, mostly studied for CL and lactides, proceed as living/controlled polymerizations. Since polymer end groups are hydroxyl groups, then, as it was shown in several papers, any initiator with one or many hydroxyl groups provides macromolecules with the corresponding architecture. The papers on synthetic methods are not discussed in detail.
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Affiliation(s)
- Stanislaw Penczek
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Julia Pretula
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland
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18
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Davis BJ, Thapa K, Hartline MC, Fuchs WK, Blanton MD, Wiggins JS, Simon YC. Enhanced photodegradation of
TiO
2
‐containing poly(ε‐caprolactone)/poly(lactic acid) blends. JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1002/pol.20210064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Brad J. Davis
- School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg Mississippi USA
| | - Kundu Thapa
- School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg Mississippi USA
| | - Matthew C. Hartline
- School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg Mississippi USA
| | - Witold K. Fuchs
- School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg Mississippi USA
| | - Michael D. Blanton
- School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg Mississippi USA
| | - Jeffrey S. Wiggins
- School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg Mississippi USA
| | - Yoan C. Simon
- School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg Mississippi USA
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19
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Liffland S, Hillmyer MA. Enhanced Mechanical Properties of Aliphatic Polyester Thermoplastic Elastomers through Star Block Architectures. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c01357] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Stephanie Liffland
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Marc A. Hillmyer
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
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20
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Kim HJ, Hillmyer MA, Ellison CJ. Enhanced Polyester Degradation through Transesterification with Salicylates. J Am Chem Soc 2021; 143:15784-15790. [PMID: 34529416 DOI: 10.1021/jacs.1c07229] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Polyesters constitute nearly 10% of the global plastic market, but most are essentially non-degradable under ambient conditions or in engineered environments. A range of degradable polyesters have been developed as more sustainable alternatives; however, limitations of practical degradability and scalability have hindered their viability. Here, we utilized transesterification approaches, including in situ polymerization-transesterification, between a salicylate and a polyester to incorporate salicylate units into commercial polyester backbones. The strategy is scalable and practically relevant given that high molar mass polymers can be obtained from melt-processing of commercial polyesters using common compounders or extruders. Polylactide containing sparse salicylate moieties shows enhanced hydrolytic degradability in aqueous buffer, seawater, and alkaline solutions without sacrificing the thermal, mechanical, and O2 barrier properties of the parent material. Additionally, salicylate sequences were incorporated into polycaprolactone and a derivative of poly(ethylene terephthalate), and those modified polymers also exhibited facile degradation behavior in alkaline solution, further expanding the scope of this approach. This work provides insights and direction for the development of high-performance yet more sustainable and degradable alternatives to conventional polyesters.
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21
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Sajjad H, Prebihalo EA, Tolman WB, Reineke TM. Ring opening polymerization of β-acetoxy-δ-methylvalerolactone, a triacetic acid lactone derivative. Polym Chem 2021. [DOI: 10.1039/d1py00561h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
We report here the synthesis and polymerization of a novel disubstituted valerolactone, β-acetoxy-δ-methylvalerolactone, derived from the renewable feedstock triacetic acid lactone (TAL).
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Affiliation(s)
- Hussnain Sajjad
- Department of Chemistry and Center for Sustainable Polymers, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, USA
| | - Emily A. Prebihalo
- Department of Chemistry and Center for Sustainable Polymers, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, USA
| | - William B. Tolman
- Department of Chemistry, Washington University in St. Louis, One Brookings Drive, Campus Box 1134, St Louis, MO 63130-4899, USA
| | - Theresa M. Reineke
- Department of Chemistry and Center for Sustainable Polymers, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455-0431, USA
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22
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Fuoco T, Nguyen TT, Kivijärvi T, Finne-Wistrand A. Organocatalytic strategy to telechelic oligo(ε-caprolactone-co-p-dioxanone): Photocurable macromonomers for polyester networks. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.110098] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Kaluzynski K, Pretula J, Lewinski P, Kaźmierski S, Penczek S. Catalysis in polymerization of cyclic esters. Catalyst and initiator in one molecule. Polymerization of ε-caprolactone. J Catal 2020. [DOI: 10.1016/j.jcat.2020.09.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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24
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Phosphoric acids catalyzed asymmetric kinetic resolution polymerization of benzyl substituted ε-caprolactones: Efficient protocol for stereogradient polycaprolactones. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109792] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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