采用分散聚合反应制备了纳米SiO2/PS包覆粒子, 并对其结构进行了表征。首先在超声波场中用表面活性剂对纳米SiO2粒子进行亲油化处理, 然后在氮气保护下利用超声波的分散、粉碎、活化、引发等多重作用, 在实现纳米SiO2粒子在反应介质中纳米分散的同时, 引发苯乙烯单体在纳米SiO2粒子表面发生分散聚合反应, 制备出纳米SiO2/PS包覆粒子。最后, 采用SEM, TEM, FTIR, XPS等测试手段对纳米SiO2/PS包覆粒子进行了表征, 测试结果表明, PS实现了对纳米SiO2的包覆, 形成了核壳包覆结构。

In this paper, the polystyrene/nano-silica composite particles were prepared and characterized according to the following steps. First, the nano-silica particles were pretreated with the surfactants under ultrasonic field. Secondly, the dispersion polymerization of styrene in a water-ethanol medium, with poly(N-vinyl pyrrolidone) (PVP) as stabilizer and 2, 2′-azobisizobutyronitrile (AIBN) as initiator in the presence of nano-silica particles was initiated through ultrasonic irradiation by taking its advantages of multieffect, i.e., dispersion, crushing, activation, and initiation. Finally, the encapsulation of composite particles were investigated with SEM, TEM, FTIR and X-ray photoelectron spectroscopy (XPS).