文献类型：期刊文献

英文题名：Epoxy vitrimer based on borate ester bond for green degradation, closed-loop recycling, and ready reprocessing

作者：Zhang, Wenhua[2];Zhou, Quan[1];Fang, Chaoyu[1];Xu, Yuan[1];Li, Xin[1];He, Qiuyan[1];Dong, Xiao[1];Qi, Yiqing[1];Wang, Bozheng[1];Li, Wentao[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tec, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Composite Mat Technol Co Ltd, Shanghai 200237, Peoples R China

年份：2022

卷号：29

期号：6

外文期刊名：JOURNAL OF POLYMER RESEARCH

收录：;EI(收录号：20222212170546);WOS:【SCI-EXPANDED(收录号:WOS:000803139600002)】；

基金：This work was supported by the Fundamental Research Funds for the Central Universities [50321042017001].

语种：英文

外文关键词：Green degradation; Thermoset; Dynamic covalent bond; Recyclable

摘要：The three-dimensional network of traditional epoxy resin endows it with suitable properties, but it also presents challenges in reprocessing and recycling. Recent years have witnessed the development of novel epoxy resins crosslinked via dynamic bonds. However, a milder and greener degradation process is still urgently needed. In this study, phenylboric acid (PBA) was selected as the curing agent for the epoxy resin (E44) to prepare an epoxy vitrimer (PBAE) containing borate ester bonds. Then properties of prepolymer and cured resin were characterized in detail, which manifested that the borate ester bond in PBAE endowed it with green degradation mode and convenient closed-loop recycling process, while maintaining good solvent resistance; besides, PBAE resin exhibited good thermal properties with a glass transition temperature of 148 degrees C, a temperature with 5% mass loss of 290 degrees C and mass residual rate at 800 degrees C is higher than 25%; the PBAE composite possessed good mechanical properties with a flexural strength of 499 MPa and an interlaminar shear strength of 46 MPa; in addition, upon heating and application of pressure, the PBAE resin readily showed self-healing or reprocessing properties.