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Kawatani R, Hagiwara K, Tanaka A, Kohsaka Y. Polythioethers bearing side groups for efficient degradation by E1cB reaction: reaction design for polymerization and main-chain scission. RSC Adv 2023; 13:20782-20786. [PMID: 37435381 PMCID: PMC10332248 DOI: 10.1039/d3ra03751g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Accepted: 06/23/2023] [Indexed: 07/13/2023] Open
Abstract
We have previously reported the polycondensation by the tandem reactions of dithiols and α-(bromomethyl)acrylates, consisting of conjugate substitution (SN2' reaction) and conjugate addition (Michael addition) reactions. The resulting polythioethers underwent a main-chain scission (MCS) by E1cB reaction, which is the reverse reaction of conjugate addition, although it was not quantitative due to the equilibrium. Herein, the modification of the structures of polythioethers led to irreversible MCS, whereby the β-positions of ester moieties were substituted with a phenyl group. This slight modification in the polymer structure influenced the monomer structures and polymerization mechanisms. The understanding of reaction mechanisms by model reactions was required to obtain high molecular weights of polythioethers. It was clarified that the consequent additions of 1,4-diazabicyclo[2.2.2]octane (DABCO), 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and PBu3 were effective to achieve high molecular weight. The resulting polythioethers decomposed by irreversible MCS via E1cB reaction with DBU.
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Affiliation(s)
- Ryo Kawatani
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan
| | - Keito Hagiwara
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan
| | - Anri Tanaka
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan
| | - Yasuhiro Kohsaka
- Faculty of Textile Science and Technology, Shinshu University 3-15-1 Tokida Ueda Nagano 386-8567 Japan
- Research Initiative for Supra-Materials (RISM), Interdisciplinary Cluster for Cutting Edge Research (ICCER), Shinshu University 4-17-1 Wakasato Nagano City Nagano 380-8553 Japan
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Kohsaka Y, Akae Y, Kawatani R, Kazama A. Polymer chemistry of α-substituted acrylates designed for functional-group synergy. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2021. [DOI: 10.1080/10601325.2021.1989311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Yasuhiro Kohsaka
- Research Initiative for Supra-Materials (RISM), Shinshu University, Nagano, Japan
- Faculty of Textile Science and Technology, Shinshu University, Nagano, Japan
| | - Yosuke Akae
- Faculty of Textile Science and Technology, Shinshu University, Nagano, Japan
- Japan Society for the Promotion of Science, Tokyo, Japan
| | - Ryo Kawatani
- Faculty of Textile Science and Technology, Shinshu University, Nagano, Japan
| | - Akane Kazama
- Faculty of Textile Science and Technology, Shinshu University, Nagano, Japan
- Japan Society for the Promotion of Science, Tokyo, Japan
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Kohsaka Y, Nagai K. Degradable and curable poly(conjugated ester)s prepared by acryl- and conjugate-substitutions of the ‘smallest’ monomer. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.110049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Zhao T, Beyer VP, Becer CR. Fluorinated Polymers via Para-Fluoro-Thiol and Thiol-Bromo Click Step Growth Polymerization. Macromol Rapid Commun 2020; 41:e2000409. [PMID: 32989854 DOI: 10.1002/marc.202000409] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Revised: 08/31/2020] [Indexed: 11/06/2022]
Abstract
Click reactions are utilized widely to modify chain ends and side groups of polymers while click polymerizations based on step-growth polymerization of bifunctional monomers have recently attracted increased attention of polymer chemists. Herein, the combination of two highly efficient click reactions, namely para-fluoro-thiol click and thiol-bromo substitution reactions, is demonstrated to form fluorinated polymers with tuned hydrophobicity owing to the nature of the dithiol linker compound. The key compound in this study is 2,3,4,5,6-pentafluoro benzyl bromide that provides the combination of thiol click reactions. The thiols used here are 4,4-thiobisbenzenthiol, 2,2'-(ethylenedioxy) diethanethiol, and 1,2-ethanedithiol that allow tuning of the properties of obtained polymers. The step-growth click reaction conditions are optimized by screening the effect of reaction temperature, base, solvent, and stochiometric ratio of the compounds. Thermal properties and hydrophobicity of synthesized polymers are determined via water contact angle, thermogravimetric analysis and differential scanning calorimetry measurements, showing thermal stability up to 300 °C, glass transition temperatures ranging from -25 to 82 °C and water contact angles ranging from 55 to 90 °C.
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Affiliation(s)
| | - Valentin P Beyer
- University of Warwick, Coventry, CV4 7AL, UK.,School of Engineering and Materials Science, Queen Mary University of London, London, E1 4NS, UK
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Hagiwara K, Kohsaka Y. Divergence of polycondensation by a tandem reaction based on sequential conjugate substitutions. Polym Chem 2020. [DOI: 10.1039/d0py00648c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Polycondensation, which was based on sequential conjugate substitution (SN2′) reactions of β-bromo-α-(bromomethyl)acrylates and dithiol, afforded diverse structures of polysulfides with exo- and endo-olefin units.
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Affiliation(s)
- Keito Hagiwara
- Faculty of Textile Science and Technology
- Shinshu University
- Ueda
- Japan
| | - Yasuhiro Kohsaka
- Faculty of Textile Science and Technology
- Shinshu University
- Ueda
- Japan
- Research Initiative for Supra-Materials (RISM)
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Kohsaka Y, Yamashita M, Matsuhashi Y, Yamashita S. Synthesis of poly(conjugated ester)s by ring-opening polymerization of cyclic hemiacetal ester bearing acryl skeleton. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2019.08.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Kohsaka Y, Nagatsuka N. End-reactive poly(tetrahydrofuran) for functionalization and graft copolymer synthesis via a conjugate substitution reaction. Polym J 2019. [DOI: 10.1038/s41428-019-0258-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Kohsaka Y, Hiramatsu A. Synthesis and Properties of Polyethers Containing 1,3-Butadiene Skeleton in the Backbone. CHEM LETT 2019. [DOI: 10.1246/cl.190381] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yasuhiro Kohsaka
- Research Initiative for Supra-Materials (RISM), Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
- Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
| | - Akira Hiramatsu
- Faculty of Textile Science and Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan
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Daglar O, Gunay US, Hizal G, Tunca U, Durmaz H. Extremely Rapid Polythioether Synthesis in the Presence of TBD. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00293] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Ozgun Daglar
- Department of Chemistry, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey
| | - Ufuk Saim Gunay
- Department of Chemistry, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey
| | - Gurkan Hizal
- Department of Chemistry, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey
| | - Umit Tunca
- Department of Chemistry, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey
| | - Hakan Durmaz
- Department of Chemistry, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey
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Kazama A, Kohsaka Y. Radical polymerization of ‘dehydroaspirin’ with the formation of a hemiacetal ester skeleton: a hint for recyclable vinyl polymers. Polym Chem 2019. [DOI: 10.1039/c9py00474b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A recyclable vinyl polymer was developed via radical polymerization of ‘dehydroaspirin’ derived from acetylsalicylic acid.
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Affiliation(s)
- Akane Kazama
- Faculty of Textile Science and Technology
- Shinshu University
- Ueda
- Japan
| | - Yasuhiro Kohsaka
- Faculty of Textile Science and Technology
- Shinshu University
- Ueda
- Japan
- Research Initiative for Supra-Materials (RISM)
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Kohsaka Y, Miyazaki T, Hagiwara K. Conjugate substitution and addition of α-substituted acrylate: a highly efficient, facile, convenient, and versatile approach to fabricate degradable polymers by dynamic covalent chemistry. Polym Chem 2018. [DOI: 10.1039/c7py02114c] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Degradable poly(conjugated ester)s with various backbones were synthesized via conjugate substitution (SN2′) polymerization of bis[α-(chloromethyl)acrylate] and nucleophilic monomers under ambient conditions.
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Affiliation(s)
- Yasuhiro Kohsaka
- Faculty of Textile Science and Technology
- Shinshu University
- Ueda
- Japan
| | - Takumi Miyazaki
- Faculty of Textile Science and Technology
- Shinshu University
- Ueda
- Japan
| | - Keito Hagiwara
- Faculty of Textile Science and Technology
- Shinshu University
- Ueda
- Japan
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Matsuoka SI, Hoshiyama Y, Tsuchimoto K, Suzuki M. Oxa-Michael Addition Reaction and Polymerization of Morita–Baylis–Hillman Adducts and Derivatives. CHEM LETT 2017. [DOI: 10.1246/cl.170794] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Shin-ichi Matsuoka
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555
| | - Yuki Hoshiyama
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555
| | - Kanae Tsuchimoto
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555
| | - Masato Suzuki
- Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, Aichi 466-8555
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