天然橡胶
共价键
弹性体
自愈
材料科学
延伸率
自愈材料
聚合
高分子化学
环氧树脂
二硫键
复合材料
聚合物
化学
有机化学
极限抗拉强度
医学
病理
生物化学
替代医学
作者
Lingli Kong,Yunpeng Yang,Mingliang Wu,Xiaodan Teng,Yueqiong Wang,Chuanhui Xu
标识
DOI:10.1016/j.ijbiomac.2022.11.040
摘要
Most of the dynamic covalent bonds (DCBs) for self-healing rubber must be activated at relatively high temperatures 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 β-hydroxyl ester bond crosslinks. As a result, a revisable covalently crosslinked network without rigid steric hindrance groups was constructed, which exhibited a super self-healing efficiency of 99 % after self-healing at 80 °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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