葡萄糖水溶液分散物系悬浮聚合法制备微米级单分散交联聚苯乙烯微球

Preparation of Micron Monodispersed Crosslinked Polystyrene Microspheres by Suspension Polymerization in Glucose Aqueous Solution as Disperse Medium

采用葡萄糖水溶液为分散介质，加入稳定剂聚乙烯醇，经悬浮聚合法合成了微米级单分散交联聚苯乙烯微球，考察了葡萄糖含量、苯乙烯用量、引发剂用量、稳定剂用量和交联剂用量对微米级甲分散变联聚苯乙烯微球粒径大小及其分布的影响。实验结果表明，最佳的悬浮聚合条件为：葡萄糖水溶液中葡萄糖的质量分数为7％～8％、苯乙烯占单体的质量分数为25％～28％、交联剂二乙烯苯占单体的质量分数为0．4％、引发剂偶氮二异丁腈占单体的质量分数为1．0％、稳定剂聚乙烯醇占单体的质量分数为4％、温度为79℃、时间为10h；在此条件下制备的微米级单分散交联聚苯乙烯微球平均直径为10-20μm，分散系数为0．020～0．046。光学显微镜观察结果表明，合成的微米级单分散交联聚苯乙烯微球的形状好。

Micron monodispersed crosslinked polystyrene microspheres were prepared by suspension polymerization in glucose aqueous solution with poly （ vinyl alcohol） （PVA） as stabilizer. Effects of mass fraction of glucose in glucose aqueous solution, styrene （St）amount, initiator dosage, stabilizer dosage and crosslinker dosage on particle size of crosslinked polystyrene microspheres and its distribution were investigated. Under optimal reaction conditions： mass fraction of glucose in glucose aqueous solution 7%-8%, w （St） = 25%-28%, mass fraction of divinyl benzene to monomer 0.4% ,mass fraction of 2,2＇ -azobisisobutyronitrile to monomer 1.0%, mass fraction of stabilizer PVA 4%, temperature 79℃ and time 10 h, average particle diameter of micron monodispersed crosslinked polystyrene microspheres prepared could reach 10-20 μm and its distribution 0.020- 0.046. Optical micrographs showed that the micron monodispersed crosslinked polystyrene microspheres were in good shape and could easily be post - treated. In above preparation less solvent was needed than traditional process.