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以苯乙烯为单体、二乙烯基苯为交联剂,采用快速膜乳化法制备了聚苯乙烯微粒,对其粒径分布、制备重复性、颗粒结构进行了表征,并考察了致孔剂种类及用量对不同粒径颗粒形态结构的影响规律.结果表明,聚苯乙烯颗粒粒径与所用膜孔径呈线性关系,最佳乳化压力与膜孔径呈反函数关系.优化工艺条件下所制颗粒粒径为1～6m,粒径分布系数均小于0.8,批次相对标准偏差低于3%.体积效应对小粒径颗粒的成型结构影响较大;粒径越小,颗粒成型时致孔剂与聚合物间的相分离程度越低,颗粒粒径小于2m时液体石蜡无法形成完整颗粒,颗粒粒径大于2m时十六烷用量在60%(ω)以下才能形成大孔结构.
Styrene as monomer and divinylbenzene as crosslinker, polystyrene microparticles were prepared by rapid membrane emulsification. Their particle size distribution, preparation reproducibility and particle structure were characterized. The effects of porogen The results showed that the particle size of polystyrene particles was linear with the membrane pore size and the optimal emulsification pressure was inversely related to the membrane pore size.The particles The particle size of 1 ~ 6m, particle size distribution coefficient were less than 0.8, the relative standard deviation of batch was less than 3% .The volume effect had a great effect on the forming structure of small particle size particles, the smaller the particle size, The lower the degree of phase separation from the polymer is, the smaller the particle size of the liquid paraffin is, the smaller the liquid paraffin can not form a complete particle. When the particle size is larger than 2m, the hexadecane content below 60% (ω) can form the macroporous structure.