在纳米硅溶胶分散介质中,以苯乙烯（St）为单体,偶氮二异丁脒盐酸盐（AIBA）为引发剂,不添加任何辅助单体,通过Pickering乳液聚合,成功制备了PSt/SiO2有机-无机复合微球,透射电镜研究显示,复合微球具有草莓型形态。所得复合微球粒径在190 nm-300 nm之间,二氧化硅吸附量介于28%-44%之间。研究了初始硅溶胶用量、AIBA用量和反应温度等因素对复合微球粒子粒径和二氧化硅吸附量的影响。结果发现,初始硅溶胶用量增大,复合微球粒径减小、二氧化硅吸附量增大;引发剂用量增加,二氧化硅吸附量增大;反应温度升高,复合微球粒径增大,但对二氧化硅吸附量影响较小。
Polystyrene /SiO2 composite microspheres were successfully prepared by Pickering emulsion polymerization using a cationic azo initiator （2, 2＇-azobis （isobutyramidine） dihydrochloride （AIBA）） in combination with a commercially available glycerol-functionalized ultrafine aqueous silica sol in the absence of any auxiliary comonomer. Transmission electron microscope （TEM） indicates polystyrene/silica particles with raspberry-like morphology. The particle sizes and final silica content range from 190 nm to 300 nm and 28 % to 44 %, respectively. The influences of initial silica content, AIBA content, reaction temperature on the average diameters and silica contents of the composite microspheres were studied. The result indicates that with the initial silica content increase, the diameter of the composite microspheres tends to decrease and the silica contents adsorbed on the latexes surface increase. The silica content increases with the increase of the AIBA amount. With the reaction temperature increase, the average diameter increases, but the variance of silica content is less.
参考文献
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