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以对苯二酚二对苯甲酸酯(HQB)、N,N’-二(ω-羟乙基)苯均四甲酰二亚胺(BHDI)、甲苯二异氰酸酯(TDI)为单体,利用溶液缩聚方法,合成了一种含有亚氨基的新型液晶聚氨酯(HBLCP),并将该液晶聚氨酯与环氧树脂(E-51)共混制备液晶聚氨酯/环氧树脂复合材料(HBLCP/E-51)。采用FTIR、DSC、POM和WAXD等方法对HBLCP的结构和液晶相转变行为进行了表征,并利用SEM观察复合材料断裂形貌,探讨其增韧机制。结果表明,加入质量分数为3%的HBLCP,可使HBLCP/E-51复合材料的冲击强度提高2.3倍,拉伸强度和弯曲强度也有不同程度的提高,呈现出典型的韧性断裂,热分解温度提高12~20℃,出现最大分解速率时的温度提高12~15℃。
The hydroquinone bis-benzoate (HQB), N, N’-bis (ω-hydroxyethyl) benzenetetracarboxylic diimide (BHDI) and toluene diisocyanate (TDI) A novel liquid crystal polyurethane (HBLCP) containing imino group was synthesized by solution polycondensation. The liquid crystal polyurethane / epoxy composite (HBLCP / E- 51). The structural and liquid crystal phase transition behaviors of HBLCP were characterized by FTIR, DSC, POM and WAXD methods. The fracture morphology of the composite was observed by SEM, and the toughening mechanism was discussed. The results showed that the impact strength of HBLCP / E-51 composites increased by 2.3 times and the tensile strength and flexural strength increased with the addition of 3% HBLCP, showing typical ductile fracture, thermal decomposition temperature Increase 12 ~ 20 ℃, when the maximum decomposition rate of the temperature increased 12 ~ 15 ℃.