This work analyzes the effect of the anhydride excess on the nonisothermal curing kinetics and on the final properties of synthetic and biobased epoxy resins. Diglycidyl ether of bisphenol A (DGEBA) and epoxidized soybean oil (ESO) were crosslinked using methyltetrahydrophthalic anhydride (MTHPA) as a curing agent and 1-methylimidazole (1MI) as an initiator. It was shown that the ESO/MTHPA/1MI system reacts slower than the DGEBA/MTHPA/1MI system, giving place to a more significant evaporation of the curing agent during the reaction. As a result, an excess of anhydride improves the final thermal properties of the ESO/MTHPA/1MI network, contrary to the behavior observed for DGEBA/MTHPA/1MI. The knowledge of the kinetics of the curing process and the optimal amount of the curing agent for each system is of critical importance for a more efficient processing of these materials.

中文翻译：

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过量酸酐对合成和生物环氧树脂的固化动力学和动态力学性能的影响

这项工作分析了酸酐过量对非等温固化动力学以及合成和生物基环氧树脂的最终性能的影响。使用甲基四氢邻苯二甲酸酐（MTHPA）作为固化剂和1-甲基咪唑（1MI）作为引发剂，将双酚A的二缩水甘油醚（DGEBA）和环氧化大豆油（ESO）交联。结果表明，ESO / MTHPA / 1MI系统的反应比DGEBA / MTHPA / 1MI系统的反应慢，在反应过程中固化剂的蒸发更为明显。结果，与DGEBA / MTHPA / 1MI观察到的行为相反，过量的酸酐改善了ESO / MTHPA / 1MI网络的最终热性能。