Abstract: The surface of nano–SiO2 was modified by coupling agent KH-570 in EtOH，and then the polystyrene was grafted to its surface. The nano-SiO2/PS composite was prepared by the melt-blending process. The surface and profiles structures of nano-SiO2/PS composite was scanned with SEM and the effect of nano-SiO2 content on the mechanical properties of nano-SiO2/PS composite was studied. The results showed that compared with pure polystyrene，the notched impact strength and tensile strength of the composite increased by 7.6% and 0.98% respectively.

摘要： 以无水乙醇为溶剂，使用偶联剂γ-(甲基丙烯酰氧)丙基三甲氧基硅烷（KH-570）对纳米SiO2 表面进行了化学改性，采用溶液聚合法在改性后的纳米粒子表面接枝苯乙烯，然后通过熔融共混法制备了纳米SiO2/PS复合材料。利用红外光谱考察了改性前后纳米SiO2与硅烷偶联剂、苯乙烯的相互作用；利用扫描电镜观察了复合材料的断面形貌结构，研究了纳米SiO2含量对复合材料力学性能的影响。结果表明：与纯聚苯乙烯相比，纳米SiO2质量分数为4%时，复合材料的缺口冲击强度提高了7.6%、拉伸强度提高了0.98%，显示出纳米SiO2对聚苯乙烯具有同时增强增韧的效果。