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Study on the properties of epoxy resin toughened by a liquid crystal-type oligomer

机译：液晶型低聚物增韧环氧树脂的性能研究

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摘要

A series of novel reactive toughening agents (LCEUPPG) containing both a flexible spacer and rigid liquid crystalline unit were synthesized to modify the bisphenol epoxy resin/dicyandiamide curing system. The curing reactivity, apparent activation energy, curing mechanism, dynamic mechanical behavior, and impact strength of the modified system were systematically studied. Compared with the unmodified system, the results indicate that LCEUPPG have greatly accelerated the curing reaction between epoxy resin and dicyandiamide, reduced the apparent activation energy of the curing reaction, enhanced the impact strength 3-7 times, and maintained high dynamic modulus and good thermal properties. In addition, SEM observation of the fracture surfaces showed a two-phase microstructure in the modified systems.
机译：合成了一系列同时包含柔性间隔基和刚性液晶单元的新型反应性增韧剂（LCEUPPG），以改进双酚环氧树脂/双氰胺固化体系。系统地研究了改性体系的固化反应性，表观活化能，固化机理，动态力学行为和冲击强度。与未改性体系相比，结果表明，LCEUPPG大大促进了环氧树脂与双氰胺的固化反应，降低了固化反应的表观活化能，提高了3-7倍的冲击强度，并保持了高动态模量和良好的热稳定性。属性。此外，在改进的系统中，SEM断裂表面的观察显示出两相的微观结构。

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