SiO2-g-PS

nano-microspheres，were prepared by grafted styrene monomer on the surface of nano-SiO2 particles with the emulsion polymerization method

and its surface and morphology were studied by TEM

FTIR

TG and XPS. The results showed that the SiO2-g-PS nano-microsphere had a structure of sphericity composed of PS and SiO2 as core and shell respectively. A composite material of SiO2-g-PS nano-microsphere and polypropylene (PP) was prepared by the melt-blending process and the mechanical performance was investigated. The results showed that the impact and tensile strength of the composite material could be improved obviously when the loading of SiO2-g-PS nano-microsphere was as low as 4%—6%(mass)

and a significant heterogeneous nucleation effect on the crystallization of PP was observed.