蒸馏沉淀聚合法制备窄分散聚二乙烯基苯-co-丙烯腈功能聚合物微球

PREPARATION OF MONODISPERSE POLY(DIVINYLBENZENE-co-ACRYLONITRILE) MICROSPHERES BY DISTILLATION PRECIPITATION POLYMERIZATION

采用蒸馏沉淀聚合法,利用过氧化苯甲酰(BPO)为引发剂,在不加任何稳定剂和不搅拌的情况下,丙烯腈(AN)和二乙烯基苯(DVB)为共聚单体制备了不同交联度的微米和亚微米窄分散聚合物微球,考查了共聚单体对球体的影响,并用扫描电镜(SEM)和红外光谱对微球进行了表征.

Monodisperse poly （divinylbenzene-co-acrylonitrile） （ poly （DVB-co-AN）） microspheres with active cyano groups on the surface and particle size in the range of 0.45 - 1.79 μm were prepared by distillation- precipitation polymerization in neat acetonitrile in the absence of any stabilizer or additive without stirring and with benzoylperoxide （BPO） as initiator. The comonomer feed ratio has much effect on the morphology and the size of the resultant polymer particles. The SEM images indicated that the copolymer microspheres have spherical shape with smooth surfaces in monodispersity with AN fraction in comonomer feed from 0 to 0.60.The results demonstrated that more functional cyano groups were successfully incorporated into the outer solvent-swollen gel layer of the resultant polymer microspheres with increase AN fraction in comonomer feed.The distillation of a portion of the solvent out of the reaction system during the polymerization was a key problem to avoid the coagulatiou and afford monodisperse polymer microspheres for the distillation precipitation copolymerization of DVB and AN in acetonitrile.