分散共聚合制备PSt-AA-EGDMA功能性单分散微米级交联微球的研究  

Studies on Dispersion Copolymerization of St-AA-EGDMA for Preparing Monodisperse Micron-size Functional Microspheres

作　　者：张洪涛[1] 吕睿[1] 陈敏[1] 

机构地区：[1]湖北大学化学与材料科学学院,武汉430062

出　　处：《高等学校化学学报》2004年第2期366-371,共6页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 0 3 740 19)资助

摘　　要：以苯乙烯 ( St)为主单体 ,丙烯酸 ( AA)为功能单体 ,乙二醇二甲基双丙烯酸酯 ( EGDMA)为交联单体 ,聚乙烯吡咯烷酮 ( PVP)为稳定剂 ,偶氮二异丁腈 ( AIBN)为引发剂 ,乙醇 /水混合溶剂为分散介质 ,用分散聚合法一步合成了功能性单分散大粒径 ( 1 0～ 2 0 μm)交联聚苯乙烯微球 .研究了 PSt-AA-EGDMA三元分散共聚合体系的动力学 ,由转化率 -时间关联得到动力学方程 :Rp=k[I]0 .1 3( [St]1 .87+[AA]0 .1 3+[EGDMA]0 .2 )·( 1 +[PVP]0 .0 2 ) exp( -E/ RT) .详细讨论了 AA,EGDMA,PVP的浓度和溶剂极性对羧基分布的影响 ,阐述了 AA和 EGDMA对粒子形态。Dispersion copolymerization of styrene(St), acrylic acid(AA) as functional monomer and ethylene glycol dimethacrylate(EGDMA) as the crosslinking monomer was carried out in ethanol/water mixture as the media by using poly(N-vinylpyrrolidone)(PVP), 2,2-azo-bisisobutyronitrile(AIBN) as the stabilizer and initiator, respectively. Monodisperse micron-size crosslinked polystyrene microspheres-containing carboxyl were directly prepared by one-step method of dispersion copolymerization. Polymerization kinetics was researched and kinetics formula, R_p=k[I] 0.13([St] 1.87+[AA] 0.13+[EGDMA] 0.2)·({1+[PVP] 0.02})exp(-E/RT), was rendered. The effects of concentration of AA, EGDMA, PVP and solvent polarity on the carboxyl distribution were discussed in detail. The effects of concentration of AA and EGDMA on particle morphology, particle size and size distribution and carboxyl distribution were also researched.

关 键 词：苯乙烯 丙烯酸 乙二醇二甲基双丙烯酸酯 PSt-AA-EGDMA 功能性单分散微米级交联微球 分散共聚合 制备 反应条件 

分 类 号：O632.13[理学—高分子化学]