【摘要】 以过硫酸钾(KPS)为引发剂,以水为反应介质,采用无皂乳液聚合工艺,制备出粒径在500nm左右单分散(分散系数<5%)聚苯乙烯微球。所制备的聚苯乙烯微球为光滑的球形颗粒。研究发现:由无皂乳液聚合法制备的胶体颗粒其ζ电势在不同的离子强度下随pH的变化曲线均出现平台pH6～10.5,说明在一定的离子强度和pH条件下,聚苯乙烯胶乳的ζ电势具有良好的稳定性。聚苯乙烯胶乳有望作为具有一定电势值的标准颗粒。更多还原

【Abstract】 The water systems have been exploited as dispersion medium in soap-free polymerization of polystyrene (PS) using potassium persulfate as an initiator.The size of particles is round 500nm(coefficient of variation <5 %). The study on the curves of Zeta-potential (ζ) versus pH in different ionic strength showed that the polystyrene colloidal particles prepared by soap-free emulsion polymerization are rather stable their ζ-potential were invariable with the pH varied from 6 to 10.5, so the PS microspheres could be used as a particle model for its ζ-potential value.更多还原