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用Stber法合成了单分散的SiO2微球,然后通过表面改性和室温缩合反应,在SiO2微球表面引入偶氮基团,从而制备得到SiO2引发剂。利用该引发剂原位引发苯乙烯进行自由基聚合,在SiO2微球表面成功接枝上聚苯乙烯分子链(PS),从而制备得到SiO2-PS复合微球。研究结果表明:合成的SiO2微球和SiO2引发剂均具有良好的球形形态,其粒径分别为250 nm和280nm。SiO2引发剂原位引发苯乙烯聚合后,在SiO2微球表面接枝上厚度约为40 nm的聚苯乙烯壳层,其约占复合微球质量的32%,从而形成了以SiO2微球为核、以聚苯乙烯为壳的无机/有机杂化微球。
Monodispersed SiO2 microspheres were synthesized by Stöber method. Then, azo initiators were introduced into the surface of SiO2 microspheres through surface modification and condensation reaction at room temperature to prepare SiO2 initiators. The initiator was used to initiate the free radical polymerization of styrene in situ to successfully graft the polystyrene molecular chain (PS) on the surface of the SiO2 microspheres to prepare SiO2-PS composite microspheres. The results show that the synthesized SiO2 microspheres and SiO2 initiator have a good spherical morphology with particle sizes of 250 nm and 280 nm, respectively. After SiO2 initiator initiates styrene polymerization in situ, a polystyrene shell with a thickness of about 40 nm is grafted onto the surface of the SiO2 microspheres, accounting for about 32% of the composite microspheres. Thus, SiO2 microspheres are formed Nuclear, polystyrene shell hybrid inorganic / organic hybrid microspheres.