Boron nitride and hyperbranched polyamide assembled recyclable polyisoprene vitrimer with robust mechanical properties, high thermal conductivity and remoldability
Boron nitride and hyperbranched polyamide assembled recyclable polyisoprene vitrimer with robust mechanical properties, high thermal conductivity and remoldability
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氮化硼和超支化聚酰胺组装的可回收聚异戊二烯 vitrimer 具有强大的机械性能、高导热性和可重塑性
DOI：
10.1016/j.polymer.2020.122964
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发表时间：
2020-11-03
期刊：
影响因子：
4.6
通讯作者：
Bai, Chenxi
中科院分区：
文献类型：
--
作者：
Huang, Lingyun;Yang, Yinxin;Bai, Chenxi
橡胶具有优异的柔软性和弹性，在热管理领域有着巨大的应用潜力，但其导热系数低限制了其应用，硫化橡胶也存在不可回收的问题。因此，开发具有良好机械性能、高导热性的可回收橡胶基材料仍然是一个挑战。本文通过端羧基超支化聚酰胺（HBPA）将动态β-羟基酯键引入到环氧化氮化硼（EBN）和环氧化聚异戊二烯（EPI）基体的复合材料中，形成动态共价交联的橡胶基玻璃化聚合物。共价键介导的界面减少了声子散射，并使材料在50 phr（份/100份橡胶）的EBN负载下具有0.51 W/mK的相对高的热导率。此外，可交换键的引入使材料能够在高温下改变网络拓扑结构，表现出优异的可回收性和可再成型性。
Rubber has huge potential applications for thermal management due to its outstanding softness and elasticity, however, its low thermal conductivity limits its applications, and the vulcanized rubber also has the problem of being unrecoverable. Therefore, the development of recyclable rubber-based material with good mechanical properties, high thermal conductivity remains a challenge. Herein, the dynamic (3-hydroxyl ester bonds were introduced into the composites of the epoxidized boron nitride (EBN) and the epoxidized polyisoprene (EPI) matrix via carboxyl-terminated hyperbranched polyamide (HBPA), forming dynamic covalently cross-linking rubber-based vitrimers. The covalent-bonds-mediated interface reduces the phonon scattering and enables the material to have a relatively high thermal conductivity of 0.51 W/mK under a loading of 50 phr (parts per one hundred parts of rubber) of EBN. In addition, the introduction of exchangeable bonds brings the materials the capability to change the network topology at high temperatures, exhibiting excellent recyclability and remoldability.