Biomass-derived dynamic covalent epoxy thermoset with robust mechanical properties and facile malleability  

作　　者：Xiao-Min Ding Li Chen Xi Luo Feng-Ming He Yan-Fang Xiao Yu-Zhong Wang 

机构地区：[1]The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE),National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan),State Key Laboratory of Polymer Materials Engineering,College of Chemistry,Sichuan University,Chengdu 610064,China

出　　处：《Chinese Chemical Letters》2022年第6期3245-3248,共4页中国化学快报（英文版）

基　　金：the National Science Foundation of China(Nos.51822304,51773137);the 111 Project(No.B20001);Fundamental Research Funds for the Central Universities are sincerely acknowledged。

摘　　要：Biomass-derived dynamic covalent thermoset has been considered as a promising solution to the high dependence on fossil resources and the difficulty in recyclability after curing of conventional bisphenol A epoxy resins.However,the design and preparation of a dynamic covalent biobased epoxy thermoset with both comparable thermal and mechanical performances to bisphenol A epoxy resins and reprocessibility remains a significant challenge.Herein,based on imine chemistry,a novel Schiff base-containing dynamic covalent epoxy thermoset was facilely fabricated from biobased protocatechualdehyde and synthetic siloxane diamine.Due to the more reactive epoxides in the epoxy monomer than in bisphenol A epoxy oligomer,the thermoset exhibited a high cross-linking density,resulting in high thermal stability and glass transition temperature.The rigid aromatic Schiff base moieties endowed the thermoset with excellent mechanical properties:Thanks to the plasticization of the flexible siloxane,the thermoset displayed high impact strength.Meanwhile,owing to the high segmental mobility,the fast exchange of imine bonds was guaranteed;and the thermoset was able to be recycled through reprocessing.Taking these features,this work provided great potential for designing and preparing sustainable substitutes for bisphenol A epoxy resins in the high-performance applications.

关 键 词：Epoxy resin Dynamic covalent thermoset Protocatechualdehyde Imine chemistry High-performance 

分 类 号：TQ323.5[化学工程—合成树脂塑料工业]