原位乳液聚合法制备纳米SiO_2/聚苯乙烯杂化材料

Synthesis of SiO_2/Polystyrene Hybrid Material by In-Situ Emulsion Grafting Process

以乙烯基三乙氧基硅烷为原料,采用溶胶-凝胶法一步制备了含有乙烯基功能团的SiO_2球形粒子,然后通过原位乳液聚合将聚苯乙烯接枝到乙烯基功能化SiO_2表面,考察了引发剂用量和苯乙烯加入量对聚合反应的单体转化率及杂化材料性能的影响,并采用傅利叶红外光谱(FT-IR)、热重分析(TGA)、扫描电镜(SEM)和透射电镜(TEM)对SiO_2/聚苯乙烯杂化材料的结构性能及形貌进行了表征。结果表明,聚苯乙烯已接枝到乙烯基功能化SiO_2表面,得到草莓状核壳结构的纳米SiO_2/聚苯乙烯杂化材料。

SiO2 spherical particles with vinyl functional groups were prepared using vinyltriethoxy silane （VTES） as material by one-step sol-gel method. The SiO2/polystyrene （SiO2/PS） inorganic-organichybrid material was prepared by grafting polystyrene on the surface of the SiO2 spherical particles by in-situ emulsion polymerization and characterized by means of Fouriert transform infrared spectroscopy （FT-IR）, scanning electron microscope （SEM）, transmission electron microscope （TEM） and thermogravimetric analysis （TGA）. The effects of the dosage of initiator and styrene on styrene conversion were investigated. The results showed that the polystyrene was grafted on the surface of vinyl functional silica and the SiOJPS hybrid material was strawberry-like core-shell structure.