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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。
The nano-SiO2 particles were prepared by Stöber method, and their surface modification was carried out to make them have suitable surface wettability. The styrene / water Pickering emulsion was constructed by using the SiO2 powder as stabilizer, and the styrene monomer in the oil phase was polymerized to prepare polystyrene / SiO2 composite microspheres with core-shell structure. The morphologies of the microspheres were characterized by SEM. It was confirmed that the nano-SiO2 did form a tight coating on the surface of the polystyrene core. The formation mechanism of composite microspheres was discussed, and the effect of water phase nucleation on the morphology of composite microspheres was investigated. The results show that the inhibition of water phase nucleation greatly affects the dispersibility of the microspheres. Adding a polymerization inhibitor to the aqueous phase and increasing the concentration of the nano-SiO2 can improve the dispersibility of the polystyrene / SiO2 composite microspheres.