SiO_2-P(St-EMA)纳米微球的制备及在PP中的应用

Preparation of SiO_2-P(St-EMA) Nanospheres and Its Application in PP Matrix

采用多步乳液聚合法在纳米SiO2表面接枝苯乙烯(St)和甲基丙烯酸乙酯(EMA),制得具有核壳结构的SiO2-P(St-EMA)纳米微球,并通过熔融共混方法制备该微球和聚丙烯(PP)基复合材料,研究其力学性能和结晶性能。研究结果表明:SiO2-P(St-EMA)纳米微球具有以SiO2为核,P(St-EMA)为壳的核壳结构,可明显改善纳米SiO2的分散性;当SiO2-P(St-EMA)的填充量达到1%时,复合材料的拉伸强度和冲击强度就有明显的提高,并可在PP中起到异相成核作用,提高PP的结晶温度和熔融温度。

SiO2-P（St-EMA） nanospheres were prepared by grafted styrene and ethyl methacrylate on the surface of nano- SiO2 with the multistage emulsion polymerization method. The composite material of SiO2-P （St-EMA） nanospheres and polypropylene （PP） were prepared by the melt-blending process, the mechanical and crystallization properties were investigated, The results demonstrated that SiO2-P（St-EMA） nanospheres had a structure of sphericity composed of SiO2 as core and P（St-EMA） as shell and it improved the dispersion obviously. The impact and tensile strength of SiO2-P（ St-EMA）/ PP were improved significantly when the loading of SiO2-P （St-EMA） was as low as 1% , and the heterogeneous nucleation effect of nano-SiO2 increased the crystallization temperature and melting temperature.