Anhydride-epoxy adhesives are prospective due to their lower viscosity, excellent bonding strength, long life cycle, and great electrical properties. In this study, anhydride curing agents (methyl nadic anhydride (MNA), methyl tetrahydrophthalic anhydride (MTHPA), maleic anhydride (MA) and octenyl succinic anhydride (OSA)) with different side group structures were selected to elucidate the structure-activity relationships between the molecular structure of the anhydride curing agents and the performance of epoxy adhesives. The curing behavior of anhydride-epoxy systems indicated that the steric hindrance of anhydride curing agent significantly reduces the reactivity of the curing reaction. Therefore, the order of curing agent activity was MA, MTHPA, MNA and OSA. The experimental and molecular dynamics (MD) simulation results showed that the anhydride-epoxy systems with stronger anhydride side groups had higher glass transition temperatures () and mechanical moduli, at the equivalent curing degree. Furthermore, the lower mean square displacement (MSD) and fractional free volume (FFV) indicated the stronger thermo-mechanical properties in the anhydride-epoxy system. Overall, this investigation provides a dependable theoretical basis for developing high-performance epoxy adhesives.

中文翻译：

---

不同酸酐环氧胶粘剂的固化行为及热机械性能研究


酸酐-环氧胶粘剂具有较低的粘度、优异的粘接强度、较长的使用寿命和良好的电性能，具有广阔的前景。本研究选择具有不同侧基结构的酸酐固化剂（甲基纳迪克酸酐（MNA）、甲基四氢邻苯二甲酸酐（MTHPA）、马来酸酐（MA）和辛烯基琥珀酸酐（OSA））来阐明它们之间的构效关系。酸酐固化剂的分子结构和环氧粘合剂的性能。酸酐-环氧体系的固化行为表明，酸酐固化剂的空间位阻显着降低了固化反应的反应活性。因此，固化剂活性的顺序为MA、MTHPA、MNA和OSA。实验和分子动力学（MD）模拟结果表明，在同等固化程度下，具有较强酸酐侧基的酸酐-环氧体系具有较高的玻璃化转变温度（）和机械模量。此外，较低的均方位移（MSD）和自由体积分数（FFV）表明酸酐-环氧树脂体系具有更强的热机械性能。总的来说，这项研究为开发高性能环氧粘合剂提供了可靠的理论基础。