Design of epoxidized natural rubber/poly(lipoic acid) elastomer with fast and efficient self-healing under a mild temperature

文献类型： 外文期刊

第一作者： Kong, Lingli

作者： Kong, Lingli;Yang, Yunpeng;Wu, Mingliang;Xu, Chuanhui;Wang, Yueqiong;Xu, Chuanhui;Xu, Chuanhui;Xu, Chuanhui

作者机构：

关键词： Self -healing; Recycling; Mechanical testing

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.025； 五年影响因子：7.626 ）

ISSN： 0141-8130

年卷期： 2022 年 223 卷

页码：

收录情况： SCI

摘要： Most of the dynamic covalent bonds (DCBs) for self-healing rubber must be activated at relatively high tem-peratures due to the requirement of high energy during the exchange of dynamic bonds, which may lead to unexpected degradation or excessive crosslinking of rubber. Herein, we designed and fabricated a highly stretchable, self-healable and reprocessable rubber by introducing dynamic disulfide bonds into the crosslink network of epoxidized natural rubber (ENR). Lipoic acid (LA) was firstly uniformly dispersed into ENR via a latex film formation technique, and then underwent a dynamic covalent ring-opening self-polymerization during hot pressing process, during which the carboxyl group of poly(LA) attacked the epoxy group of ENR to form beta-hy-droxyl ester bond crosslinks. As a result, a revisable covalently crosslinked network without rigid steric hin-drance groups was constructed, which exhibited a super self-healing efficiency of 99 % after self-healing at 80 degrees C for only 3 h. The elongation at break of the elastomer could reach 1115 % and the recovery rate of reprocessing was as high as 91 %.

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