可逆加成-断裂链转移聚合-细乳液聚合法合成聚异戊二烯-b-聚苯乙烯-b-聚甲基丙烯酸甲酯三嵌段共聚物

Synthesis of PIP-b-PS-b-PMMA triblock copolym-er by RAFT-microemulsion polymerization

在水分散的细乳液体系中,以S-正十二烷基-S′-(α,α′-二甲基-α″-乙酸基)三硫代碳酸酯为链转移剂、偶氮二氰基戊酸为引发剂,采用连续加料的方式,依次引发异戊二烯、苯乙烯和甲基丙烯酸甲酯等单体聚合,制备了结构明确的聚异戊二烯-b-聚苯乙烯-b-聚甲基丙烯酸甲酯三嵌段共聚物。采用凝胶渗透色谱、核磁氢谱和差示量热等方法对嵌段聚合物进行了表征。

In aqueous dispersion/microemulsion system,with S-1-dodecyl-S′-（α,α′-dimethyl-α″-aceticacid）trithiocarbonate as chain transfer agent,4,4′-azobis（4-cyanopentanoic acid）as the initiator,triblock copolymer polyisoprene-b-polystyrene-b-poly（methyl methacrylate）was synthesized by RAFT-microemulsion polymerization.Where monomers such as,isoprene,styrene and methyl methacrylate were added and initiated successively.The structure of PIP-b-PS-b-PMMA was confirmed by GPC,1 H-NMR and DSC.