一种基于酯交换的可重塑成型白藜芦醇基环氧树脂

A remodeling resveratrol-based epoxy resin based on transesterification

针对传统环氧树脂原料高度依赖石油资源和固化后难以回收利用的问题,开发一种生物基可回收环氧树脂。以白藜芦醇和琥珀酸酐为原料,基于两者间的酯化反应,在不添加溶剂的情况下,通过一步反应法制备一种生物基多元羧酸环氧树脂固化剂(CFR),并用CFR固化双酚F型环氧树脂。使用CFR固化的环氧树脂在室温下具有与商品化树脂相当的拉伸强度(79 MPa),玻璃化转变温度为101℃。由于酯键能在加热条件下进行可逆交换,CFR固化的环氧树脂可通过热压进行重塑成型,再次成型后环氧树脂的拉伸强度保持率可达99.2%。室温下,用CFR固化的环氧树脂35 min内可在NaOH水溶液(1 mol/L)中完全降解。固化后的环氧树脂在多种常规有机溶剂中表现出优良的耐溶剂性。

In order to solve the problem that traditional epoxy resin materials are highly dependent on petroleum resources and difficult to recycle after curing,this study aims to develop a bio-based recyclable epoxy resin.Resveratrol and succinic anhydride were used as raw materials,and based on the esterification reaction between the two materials,a bio-based polycarboxylic acid epoxy resin curing agent(CFR)was prepared by a one-step reaction method without adding solvents,and bisphenol F-type epoxy resin was cured with CFR.The CFR-cured epoxy resin has a tensile strength(79 MPa)comparable to that of commercial resins at room temperature,and its glass transition temperature is 101℃.Due to the reversible exchange of ester bonds under heating conditions,the CFR-cured epoxy resin can be reshaped by hot pressing,and the tensile strength retention rate of the epoxy resin after remolding can reach 99.2%.In addition,the epoxy cured with CFR can be completely degraded in aqueous NaOH solution(1 mol/L)within 35 min at room temperature.The cured epoxy resin showed excellent solvent resistance in many conventional organic solvents.