通过烯烃嵌段共价键交换实现具有可重构网络结构的星形聚合物网络弹性体

IF 5.2 Q1 POLYMER SCIENCE
Renan Sasaki, Naoko Yoshie and Shintaro Nakagawa*, 
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引用次数: 0

摘要

以端连单分散星形聚合物为原料,通过结合动态共价键(DCBs)制备了具有良好网络结构的共价自适应网络(CAN)弹性体。合成了端基为乙烯基的单分散四臂星形聚酯,并通过烯烃转化反应进行端连接,得到了交联链长均匀的弹性体。良好的网状结构使弹性体具有良好的力学性能。网络中剩余的C = C键可以通过烯烃分解交换,使网络结构可重构。结果表明,弹性体表现出应力松弛,并可热再加工。此外,该弹性体在温和条件下通过C = C键交换被化学降解为非交联聚合物。本研究通过明确定义的网络结构和相关dcb的结合,展示了橡胶材料的机械稳健性和动态性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Star Polymer Network Elastomer with Reconfigurable Network Structure via Covalent Bond Exchange through Olefin Metathesis

Star Polymer Network Elastomer with Reconfigurable Network Structure via Covalent Bond Exchange through Olefin Metathesis

A covalent adaptable network (CAN) elastomer with a well-defined network structure was fabricated by end-linking monodisperse star polymers via associative dynamic covalent bonds (DCBs). Monodisperse 4-arm star-shaped polyesters with vinyl end groups were synthesized and end-linked by an olefin metathesis reaction, yielding an elastomer with a uniform chain length between cross-links. The well-defined network structure endowed the elastomer with good mechanical properties. The remaining C═C bonds in the network could exchange via olefin metathesis, rendering the network structure reconfigurable. As a result, the elastomer showed stress relaxation and was thermally reprocessable. Moreover, the elastomer was chemically degradable into un-cross-linked polymers under mild conditions through C═C bond exchange. This study demonstrates mechanical robustness and dynamicity in rubbery materials through the combination of a well-defined network structure and associative DCBs.

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来源期刊
CiteScore
10.40
自引率
3.40%
发文量
209
审稿时长
1 months
期刊介绍: ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.
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