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

IF 5.1 Q1 POLYMER SCIENCE

ACS Macro Letters Pub Date : 2025-04-02 DOI:10.1021/acsmacrolett.5c00135

Renan Sasaki, Naoko Yoshie, Shintaro Nakagawa

引用次数: 0

Abstract

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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通过关联动态共价键（DCB）端接单分散星形聚合物，制造出了一种具有明确网络结构的共价适应性网络（CAN）弹性体。通过烯烃偏析反应合成了带有乙烯基端基的单分散 4 臂星形聚酯并进行端接，从而获得了一种交联间链长均匀的弹性体。清晰的网络结构赋予了这种弹性体良好的机械性能。网络中剩余的 C═C 键可通过烯烃偏聚反应进行交换，从而使网络结构可重新配置。因此，这种弹性体表现出应力松弛，并可进行热再加工。此外，在温和的条件下，通过 C═C 键交换，该弹性体还可化学降解为未交联的聚合物。这项研究通过明确定义的网络结构和关联性 DCB 的结合，证明了橡胶材料的机械稳健性和动态性。

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来源期刊

ACS Macro Letters 化学-

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.