中文摘要：

通过熔融共混法制备了聚丙烯（PP）／SiO2纳米复合材料，并使用扫描电镜（SEM），电子拉力机和冲击机等对材料进行表征。研究发现硅烷偶联剂对纳米SiO2在聚丙烯（PP）中的分散起一定的作用，但不是非常有效。添加相容剂PP-g-MAH后，可以使纳米SiO2均匀地分散于PP中。当纳米SiO2含量为2重量份时，PP/SiO2纳米复合材料的性能最优，与纯PP相比较，Izod冲击强度提高了90％，拉伸强度略微提高了5％，弯曲强度提高了23%。最后，作者对纳米SiO2的增韧机理和PP-g-MAH大幅度改善纳米SiO2在PP中分散效果的机理作了初步推断。

英文摘要：

The Polypropylene （PP）/SiO2 nanocomposites were prepared by direct melt mixing method and the resultant materials were characterized by Scanning Electron Microscopy（SEM）, electron tensile machine, impact pendulum machine, etc. The results showed that silane coupling agent had certain effect but not very efficient on the dispersion of nano-SiO2. And the nano-SiO2 particles were well-dispersed in PP matrix when added maleated polypropylene （PP-g-MAH）. With 2 wt% nano-SiO2, the mechanical properties of nanocomposites were optimum. Compared with pure PP, the Izod impact strength of the nanocomposite increased by 90%, tensile strength slightly increased by 5% and the flexural modulus increased by 23%. In the end, the mechanism of PP toughened by nano- SiO2 particles was put forward, and a model was proposed about the reason why PP-g-MAH could improve the dispersing effect in PP matrix.