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Chen Y, Liu S, Zhao J, Pahovnik D, Žagar E, Zhang G. Chemoselective Polymerization of Epoxides from Carboxylic Acids: Direct Access to Esterified Polyethers and Biodegradable Polyurethanes. ACS Macro Lett 2019; 8:1582-1587. [PMID: 35619392 DOI: 10.1021/acsmacrolett.9b00789] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Carboxylic-acid-initiated ring-opening polymerization (ROP) of epoxides is a fast approach to esterified polyethers which are cleavable at the termini or centers. A major challenge lies in conventional ROP methods because of the lability of ester groups formed in the initiation step. Here, we describe chemoselective ROP of epoxides from aliphatic, aromatic, and methacrylic carboxylic acids using two-component metal-free catalysts. Transesterification is clearly absent so that well-defined α-(carboxylic ester)-ω-hydroxy polyethers are generated in one step from monocarboxylic acids. The livingness of the ROP is verified despite the slow initiation mode. The ester end group can be readily cleaved from the polyether hydrolytically. An α,ω-dihydroxy poly(propylene oxide) with two central ester groups is generated from a diacid initiator and transformed in situ by the same catalyst to polyurethane which shows distinct enzymatic degradability. This study provides convenient access to α,ω-heterobifunctional polyethers with cleavable, releasable, or modifiable end groups and to biodegradable polyether-based materials.
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Affiliation(s)
- Ye Chen
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Shan Liu
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
| | - Junpeng Zhao
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
- Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, China
| | - David Pahovnik
- Department of Polymer Chemistry and Technology, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Ema Žagar
- Department of Polymer Chemistry and Technology, National Institute of Chemistry, Hajdrihova 19, 1000 Ljubljana, Slovenia
| | - Guangzhao Zhang
- Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China
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Myllymäki TTT, Nonappa, Yang H, Liljeström V, Kostiainen MA, Malho JM, Zhu XX, Ikkala O. Hydrogen bonding asymmetric star-shape derivative of bile acid leads to supramolecular fibrillar aggregates that wrap into micrometer spheres. SOFT MATTER 2016; 12:7159-65. [PMID: 27491728 PMCID: PMC5322467 DOI: 10.1039/c6sm01329e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 07/27/2016] [Indexed: 06/06/2023]
Abstract
We report that star-shaped molecules with cholic acid cores asymmetrically grafted by low molecular weight polymers with hydrogen bonding end-groups undergo aggregation to nanofibers, which subsequently wrap into micrometer spherical aggregates with low density cores. Therein the facially amphiphilic cholic acid (CA) is functionalized by four flexible allyl glycidyl ether (AGE) side chains, which are terminated with hydrogen bonding 2-ureido-4[1H]pyrimidinone (UPy) end-groups as connected by hexyl spacers, denoted as CA(AGE6-C6H12-UPy)4. This wedge-shaped molecule is expected to allow the formation of a rich variety of solvent-dependent structures due to the complex interplay of interactions, enabled by its polar/nonpolar surface-active structure, the hydrophobicity of the CA in aqueous medium, and the possibility to control hydrogen bonding between UPy molecules by solvent selection. In DMSO, the surfactant-like CA(AGE6-C6H12-UPy)4 self-assembles into nanometer scale micelles, as expected due to its nonpolar CA apexes, solubilized AGE6-C6H12-UPy chains, and suppressed mutual hydrogen bonds between the UPys. Dialysis in water leads to nanofibers with lateral dimensions of 20-50 nm. This is explained by promoted aggregation as the hydrogen bonds between UPy molecules start to become activated, the reduced solvent dispersibility of the AGE-chains, and the hydrophobicity of CA. Finally, in pure water the nanofibers wrap into micrometer spheres having low density cores. In this case, strong complementary hydrogen bonds between UPy molecules of different molecules can form, thus promoting lateral interactions between the nanofibers, as allowed by the hydrophobic hexyl spacers. The wrapping is illustrated by transmission electron microscopy tomographic 3D reconstructions. More generally, we foresee hierarchically structured matter bridging the length scales from molecular to micrometer scale by sequentially triggering supramolecular interactions.
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Affiliation(s)
- Teemu T. T. Myllymäki
- Department of Applied Physics , Aalto University , P.O. Box 15100 , FI-00076 AALTO , Finland . ;
| | - Nonappa
- Department of Applied Physics , Aalto University , P.O. Box 15100 , FI-00076 AALTO , Finland . ;
| | - Hongjun Yang
- Department of Chemistry , Université de Montréal , C.P. 6128 , Succursale Centre-ville , Montréal , QC H3C 3J7 , Canada
| | - Ville Liljeström
- Department of Applied Physics , Aalto University , P.O. Box 15100 , FI-00076 AALTO , Finland . ;
| | - Mauri A. Kostiainen
- Department of Biotechnology and Chemical Technology , Aalto University , P.O. Box 16100 , FI-00076 AALTO , Finland
| | - Jani-Markus Malho
- Department of Applied Physics , Aalto University , P.O. Box 15100 , FI-00076 AALTO , Finland . ;
| | - X. X. Zhu
- Department of Chemistry , Université de Montréal , C.P. 6128 , Succursale Centre-ville , Montréal , QC H3C 3J7 , Canada
| | - Olli Ikkala
- Department of Applied Physics , Aalto University , P.O. Box 15100 , FI-00076 AALTO , Finland . ;
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Strandman S, Zhu XX. Self-Healing Supramolecular Hydrogels Based on Reversible Physical Interactions. Gels 2016; 2:E16. [PMID: 30674148 PMCID: PMC6318650 DOI: 10.3390/gels2020016] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 03/23/2016] [Accepted: 03/28/2016] [Indexed: 12/26/2022] Open
Abstract
Dynamic and reversible polymer networks capable of self-healing, i.e., restoring their mechanical properties after deformation and failure, are gaining increasing research interest, as there is a continuous need towards extending the lifetime and improving the safety and performance of materials particularly in biomedical applications. Hydrogels are versatile materials that may allow self-healing through a variety of covalent and non-covalent bonding strategies. The structural recovery of physical gels has long been a topic of interest in soft materials physics and various supramolecular interactions can induce this kind of recovery. This review highlights the non-covalent strategies of building self-repairing hydrogels and the characterization of their mechanical properties. Potential applications and future prospects of these materials are also discussed.
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Affiliation(s)
- Satu Strandman
- Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montreal, QC H3C 3J7, Canada.
| | - X X Zhu
- Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre-ville, Montreal, QC H3C 3J7, Canada.
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Zhang M, Strandman S, Waldron KC, Zhu XX. Supramolecular hydrogelation with bile acid derivatives: structures, properties and applications. J Mater Chem B 2016; 4:7506-7520. [DOI: 10.1039/c6tb02270g] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bile acid derivatives can form molecular hydrogels that may be useful for drug delivery, tissue engineering and nanotemplating.
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Affiliation(s)
- Meng Zhang
- Département de Chimie
- Université de Montréal
- Montreal
- Canada
| | - Satu Strandman
- Département de Chimie
- Université de Montréal
- Montreal
- Canada
| | | | - X. X. Zhu
- Département de Chimie
- Université de Montréal
- Montreal
- Canada
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Zhang M, Waldron KC, Zhu XX. Formation of molecular hydrogels from a bile acid derivative and selected carboxylic acids. RSC Adv 2016. [DOI: 10.1039/c6ra04536g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
A cholic acid dimer forms hydrogels with selected carboxylic acids via protonation and hydrogen bonding.
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Affiliation(s)
- Meng Zhang
- Département de Chimie
- Université de Montréal
- Montreal
- Canada
| | | | - X. X. Zhu
- Département de Chimie
- Université de Montréal
- Montreal
- Canada
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Bandela AK, Hinge VK, Yarramala DS, Rao CP. Versatile, Reversible, and Reusable Gel of a Monocholesteryl Conjugated Calix[4]arene as Functional Material to Store and Release Dyes and Drugs Including Doxorubicin, Curcumin, and Tocopherol. ACS APPLIED MATERIALS & INTERFACES 2015; 7:11555-66. [PMID: 25946024 DOI: 10.1021/acsami.5b02506] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Gels are interesting soft materials owing to their functional properties leading to potential applications. This paper deals with the synthesis of monocholesteryl derivatized calix[4]arene (G) and its instantaneous gelation at a minimum gelator concentration of 0.6% in 1:1 v/v THF/acetonitrile. The gel shows remarkable thermoreversibility by exhibiting Tgel→sol at ∼48 °C and is demonstrated for several cycles. The gel shows an organized network of nanobundles, while that of the sol shows spherical nanoaggregates in microscopy. A bundle with ∼12 nm diameter possessing hydrophobic pockets in itself is obtained from computationally modeled gel, and hence the gel is suitable for storage and release applications. The guest-entrapped gels exhibit the same microstructures as that observed with simple gels, while fluorescence spectra and molecular mechanics suggests that the drug molecules occupy the hydrophobic pockets. All the entrapped drug molecules are released into water, suggesting a complete recovery of the trapped species. The reusability of the gel for the storage and release of the drug into water is demonstrated for four consecutive cycles, and hence the gel formed from G acts as a functional material that finds application in drug delivery.
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Affiliation(s)
- Anil Kumar Bandela
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Vijaya Kumar Hinge
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Deepthi S Yarramala
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Chebrolu Pulla Rao
- Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Le Dévédec F, Strandman S, Baille WE, Zhu X. Functional star block copolymers with a cholane core: Thermo-responsiveness and aggregation behavior. POLYMER 2013. [DOI: 10.1016/j.polymer.2013.05.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Patil S, Patil S, Gawali S, Shende S, Jadhav S, Basu S. Novel self-assembled lithocholic acid nanoparticles for drug delivery in cancer. RSC Adv 2013. [DOI: 10.1039/c3ra42994f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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