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

编号 020034905

推送时间 20220627

研究领域 林产化工 

年份 2022 

类型 期刊 

语种 英语

标题 Epoxy vitrimer based on borate ester bond for green degradation, closed-loop recycling, and ready reprocessing

来源期刊 Journal of Polymer Research

期 第349期

发表时间 20220526

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.

服务人员 尚玮姣

服务院士 宋湛谦

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