ID | 119102 |
著者 |
川谷, 諒
Shinshu University
Hagiwara, Keito
Shinshu University
Tanaka, Anri
Shinshu University
Kohsaka, Yasuhiro
Shinshu University
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資料タイプ |
学術雑誌論文
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抄録 | 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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掲載誌名 |
RSC Advances
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ISSN | 20462069
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出版者 | The Royal Society of Chemistry
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巻 | 13
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号 | 30
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開始ページ | 20782
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終了ページ | 20786
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発行日 | 2023-07-10
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権利情報 | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (https://creativecommons.org/licenses/by/3.0/).
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言語 |
eng
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