Abstract:

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.

Key words: vanilla alcohol, epoxy resin, non-isothermal curing kinetics, mechanical properties, micromorphology structure

摘要：

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。

关键词: 香草醇, 环氧树脂, 非等温固化动力学, 机械性能, 微观形貌结构