使用功能化的共单体4-乙烯基吡啶(4VP)与苯乙烯共聚,合成了聚(苯乙烯-共-4-乙烯基吡啶)(P(St-4VP))粒子.在NH_4OH/乙醇碱性介质中,溶胶-凝胶法生成的SiO_2纳米粒子包覆在P(St-4VP)粒子表面,得到SiO_2包覆P(St-4VP)纳米复合粒子.随4VP组分增加,所制备的P(St-4VP)/SiO_2纳米复合粒子的壳层表面变得粗糙.P(St-4VP)粒子数随PVP用量增加而增加,因此纳米复合粒子的平均尺寸随PVP用量增加而下降,同时随PVP用量增加形成较平滑的SiO_2壳层.NH_4OH和正硅酸乙酯(TEOS)用量增加,复合粒子的SiO_2壳层表面粗糙程度提高.此外,复合粒子的SiO_2壳层厚度随TEOS用量增加而增加.
The poly(styrene-co-4-vinylpyridine)(P(St-4VP))particles were first synthesized by using 4-vinylpyridine(4VP)as the functional comonomer. The SiO_2 nanopartides were subsequently coated on the P(St4VP)particles through the sol-gel nano-coating process in the NH_4OH/ethanol medium. Finally， the SiO_2-coated P (St-4VP)(P(St-4VP)/SiO_2)nanocomposite particles were prepared. The roughness of the SiO_2 shall of the nanocomposite particles increased with increasing the 4VP content in the P(St-4VP)copolymer. With increasing the polyvinylpyrrolidone(PVP)content， the amounts of the P(St-4VP)particles increased， and thus the size of the nanocomposite particles decreased， and synchronously the smoothness of the SiO_2 shell increased. The roughness of the SiO_2 shell of the nanocomposite particles increased with increasing the content of NH_4OH and tetraethoxysilane (TEOS). On the other hand， the thickness of the SiO_2 shell increased with increasing the TEOS content.
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