中文摘要：

选用乙烯-丙烯酸酯-甲基丙烯酸缩水甘油酯（E—MA—GMA）三元共聚物对纳米SiO2表面进行修饰包覆改性，考察改性后纳米SiO2在聚对苯二甲酸丁二醇酯（PBT）基体中的分散情况及对PBT复合材料力学性能的影响。FTIR、TEM、SEM结果表明。E—MA—GMA的环氧基团与纳米SiO2的-OH基团发生反应，破坏了SiO2的链状团聚结构，降低了纳米粒子间氢键等作用力。质量分数为10％～20％E—MA—GMA改性的纳米SiO2在PBT基体中的分散性及其与基体的相容性均得到明显改善，从而提高了PBT基复合材料的弯曲和拉伸性能。与纯PBT相比，SiO2／PBT复合材料的拉伸强度提高了9％，而弯曲强度和模量分别提高了14％和20％。

英文摘要：

Nano-SiO2 was firstly modified by coating with ethylene methyl acrylate-glycidyl methacrylate （E- MA - GMA） elastomer through the direct solvent process, and the dispersion of nano-SiO2 in PBT and the effects of modified nano-SiO2 on the properties of PBT were investigated. FTIR, TEM and SEM results indicate that the epoxy group of E- MA- GMA can react with the hydroxyl groups of the silica surface to destroy 1he aggregation of SiO2 and reduce the interactions between the nano-SiO2 particles; SEM results show that the mass ratios of 10%- 20% E- MA- GMA can improve the dispersion of nano-SiO2 in PBT and the interracial adhesion between the two phases, and thus the flexural properties and tensile strength of nano-SiO2/PBT composite are increased. The incorporation of E- MA- GMA modified SiO2 particles increases the tensile strength, flexural strength and flexural modulus by 9%,14% and 20% higher than those of pure PBT respectively.