Study On Properties Of PP/Nano-SiO₂ Composites

Polypropylene (PP)/nano-SiO₂ composites had been prepared by melt-blending process in this paper. The effect of surface treatment methods and content of nano-SiO₂ on the mechanical properties (tensile strength, impact thoughness) and crystallization property of composites were investigated. The structural morphology had been studied by scanning electron microscopy (SEM), and discussed the toughness and reinforcement mechanism nano-SiO₂ on PP.The surface of nano-SiO₂ was modified by ultrasonic dispersion, silane coupling agent and both dispersant and silane coupling agent in this paper. And PP/nano-SiO₂ composites were prepared by melt-blending process. The effect of surface treatment methods and content of nano-SiO₂ on the mechanical properties of composites were systematically investigated. The results show that the nano-SiO₂ which is modified by dispersant and silane coupling agent has a distinct effect on the toughness of PP.The crystal structure of PP and PP/nano-SiO₂ composites were studied and observed by Polarizing Microscope; The crystal charac-...