Abstract:

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.

摘要：

采用乳液聚合方法在纳米SiO₂粒子表面接枝苯乙烯（St）单体，制备了具有核/壳结构的SiO₂-g-PS纳米微球，用FTIR、TEM、XPS和TG分析了SiO₂-g-PS的结构。结果表明，乳液聚合产物基本呈球形、SiO₂为核、PS为壳的核壳结构。通过熔融共混工艺制备聚丙烯（PP）基复合材料，并对其力学性能进行了分析，结果表明，当SiO₂-g-PS填充量较低［4%～6％（质量）］时，SiO₂-g-PS/PP复合材料的冲击强度和拉伸强度明显提高，并对PP的结晶有明显的异相成核作用。