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以对羟基苯甲酸、对苯二甲酰氯和偏苯三酸酐(TMA)为原料,合成了低支化聚酯液晶聚合物(LLCP),并将其与γ-氨基六面体倍半硅氧烷(POSS)协同改性环氧树脂体系。研究结果表明,LLCP/POSS能对环氧树脂复合材料起到很好的增韧作用,改性后的环氧树脂复合材料冲击性能是纯环氧树脂的2.1倍。利用扫描电镜(SEM)观察复合材料断裂面形貌,探讨其增韧机理。热重分析(TG)表明:改性后材料的起始分解温度和最大分解速率温度分别比纯环氧树脂高出20℃和13℃,材料热稳定性提高。
Using para-hydroxybenzoic acid, terephthaloyl chloride and trimellitic anhydride (TMA) as raw materials, a low-branched polyester liquid crystal polymer (LLCP) was synthesized and coordinated with γ-aminohexahedral silsesquioxane Modified epoxy resin system. The results show that LLCP / POSS can play a good toughening effect on the epoxy resin composites. The modified epoxy resin composites impact performance is 2.1 times that of the pure epoxy resin. The morphology of the fracture surface was observed by scanning electron microscopy (SEM), and the toughening mechanism was discussed. Thermogravimetric analysis (TG) showed that the initial decomposition temperature and the maximum decomposition rate of modified materials were 20 ℃ and 13 ℃ higher than that of pure epoxy resin respectively, and the thermal stability of the materials was improved.