香草醇基环氧树脂的合成、固化动力学及性能

Synthesis,curing kinetics and properties of vanilla alcohol-based epoxy resin

以可再生香草醇为原料,合成了一种生物基环氧树脂(DGEVA)。通过使用甲基六氢苯酐(MeHHPA)作为固化剂,制备了一种新型的生物基环氧树脂交联网络(DGEVA/MeHHPA)。对其非等温固化动力学、热性能、热机械性能、机械性能和微观形貌结构进行了系统的研究,并用商用的石油基双酚A型环氧树脂组成的石油基环氧树脂体系(DGEBA/MeHHPA)进行对比。结果表明:DGEVA/MeHHPA和DGEBA/MeHHPA具有相似的固化反应活性。DGEVA/MeHHPA具有可以与DGEBA/MeHHPA相媲美的综合性能:玻璃化转变温度为82.2℃;拉伸强度和拉伸模量分别是(66.7±6)MPa和(2.8±0.1)GPa;T_(d5%)、T_(d10%)和T_(dmax)分别是242.4℃、284.9℃和392.4℃。此外,DGEVA/MeHHPA在形变过程中发生了塑性变形而吸收了更多的断裂能。DGEVA刚性骨架和低分子量带来的潜在高交联密度赋予了DGEVA优异性能,具有在实际应用中替代石油基环氧树脂的应用潜力。

A bio-based epoxy resin(DGEVA)was synthesized from renewable vanilla alcohol.A novel bio-based epoxy resin system(DGEVA/MeHHPA)was prepared by using methyl hexahydrophthalic anhydride(MeHHPA)as the curing agent.The non-isothermal curing kinetics,thermal properties,thermomechanical properties,mechanical properties and microstructure of DGEVA/MeHHPA were systematically studied,and were compared with the petroleum-based epoxy resin system(DGEBA/MeHHPA)composed of commercial petroleum-based bisphenol-A epoxy resin.The results showed that DGEVA/MeHHPA and DGEBA/MeHHPA had similar curing activity.DGEVA/MeHHPA has better comprehensive performance comparable to DGEBA/MeHHPA.Specifically,the glass transition temperature of DGEVA/MeHHPA was 82.2℃.The tensile strength and tensile modulus of DGEVA/MeHHPA were(66.7±6)MPa and(2.8±0.1)GPa,respectively.The T_(d5%),T_(d10%) and T_(dmax)of DGEVA/MeHHPA were 242.4℃,284.9℃and 392.4℃,respectively.In addition,DGEVA/MeHHPA exhibited plastic deformation during deformation and absorbed more fracture energy.The excellent comprehensive performance of DGEBA/MeHHPA lay in the unique molecular structure of DGEVA,which had great application potential in the practical application of DGEVA.