摘要
通过Stber法制得了纳米SiO2粒子,并对其进行表面改性,使之具有合适的表面润湿性。以该SiO2粉体为稳定剂构建了苯乙烯/水Pickering乳液并引发油相中的苯乙烯单体聚合,制得了核壳结构聚苯乙烯/SiO2复合微球。通过SEM对微球形貌进行表征,证实纳米SiO2确实在聚苯乙烯核表面形成了紧密包覆。探讨了复合微球的形成机理,研究了水相成核对复合微球形貌的影响。结果表明:水相成核的抑制对微球的分散性有很大影响,在水相中加入阻聚剂并提高纳米SiO2的浓度有助于提高聚苯乙烯/SiO2复合微球的分散性。
Nano-SiO2 was obtained from tetraethyl orthosilicate（TEOS）by St6ber method and modified then. Subsequently polystyrene/SiO2 microspheres were fabricated via pickering emulsion polymerization and the effect of nuclei mechanism was discussed. The result showed that with increasing nano SiO2 concentrations, the size of SiO2/polystyrene microspheres was decreased and was more dispersive due to the suppression of aqueous polymerization. Inhibitor used in aqueous phase was also propitious to the formation of dispersive microspheres.
出处
《化工新型材料》
CAS
CSCD
北大核心
2013年第10期68-70,共3页
New Chemical Materials
