共价键
聚合物
热固性聚合物
动态共价化学
材料科学
二硫键
高分子化学
智能聚合物
自愈材料
催化作用
化学工程
自愈
有机化学
化学
复合材料
分子
病理
工程类
超分子化学
医学
替代医学
生物化学
作者
Xinru Guo,Feng Liu,Meng Lv,Fengbiao Chen,Fei Gao,Zhenhua Xiong,Xuejiao Chen,Liang Shen,Faman Lin,Xuelang Gao
出处
期刊:Polymers
[MDPI AG]
日期:2022-09-21
卷期号:14 (19): 3953-3953
被引量:4
标识
DOI:10.3390/polym14193953
摘要
Introducing dynamic covalent bonding into thermoset polymers has received considerable attention because they can repair or recover when damaged, thereby minimizing waste and extending the service life of thermoset polymers. However, most of the yielded dynamic covalent bonds require an extra catalyst, high temperature and high-pressure conditions to trigger their self-healing properties. Herein, we report on a catalyst-free bis-dynamic covalent polymer network containing vinylogous urethane and disulfide bonds. It is revealed that the introduction of disulfide bonds significantly reduces the activation energy (reduced from 94 kJ/mol to 51 kJ/mol) of the polymer system for exchanging and promotes the self-healing efficiency (with a high efficiency of 86.92% after being heated at 100 °C for 20 h) of the material. More importantly, the mechanical properties of the healed materials are comparable to those of the initial ones due to the special bis-dynamic covalent polymer network. These results suggest that the bis-dynamic covalent polymer network made of disulfide and inter-vinyl ester bonds opens a new strategy for developing high-performance vitrimer polymers.
科研通智能强力驱动
Strongly Powered by AbleSci AI