中文摘要：

合成了联苯型液晶聚氨酯（ICPU），并以其为增韧荆对环氧树脂（EP）进行增韧改性，研究了LCPU含量对LCPU／EP复合材料力学性能的影响。利用X射线衍射、动态粘弹谱仪、扫描电镜等手段对LCPU／EP复合材料的动态热力学性能及断裂面的微观形貌进行了研究。结果表明，LCPU的加入使LCPU／EP复合材料的冲击强度提高2倍～3倍，弯曲强度增加了40％～60％，材料的玻璃化转变温度（Tg）及储能模量（E′g）也有很大程度的提高。

英文摘要：

Biphenyl type liquid crystalline polyurethane（LCPU） was synthesized and used as toughening to modify epoxy resin（EP）, and the effects of LCPU contents on the mechanical properties of LCPU/EP composites were studied. The fracture surface and the dynamic thermal mechanical properties of LCPU/EP composites were investigated by the X-ray diffraction （XRD） patterns, dynamic mechanical spectrometer and scanning electron microscope. The results show that the impact strength of LCPU/EP composites is increased to 2-3 times than that of pure epoxy resin, flexural strength is increased by 40% -60%. The glassy transition temperature（Tg） and the storage modulus at glassy state （E′g） of composites are improved too.