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采用一步可逆加成-断裂链转移(RAFT)聚合法合成了一系列分子量可控、分子量分布较窄的两亲性嵌段共聚物PEG-b-P(St-co-VBC),并通过凝胶渗透色谱(GPC)、核磁共振谱(NMR)、傅立叶变换红外光谱(FT-IR)和示差扫描量热仪(DSC)对所合成的嵌段共聚物进行了相关表征.结果表明,通过控制聚合单体中对氯甲基苯乙烯(VBC)和苯乙烯(St)的摩尔比,可以实现对两亲性嵌段共聚物PEG-b-P(St-co-VBC)中VBC重复单元的精确控制.随着嵌段共聚物中VBC含量的增加,PEG-b-P(St-co-VBC)的玻璃化转变温度逐渐升高.
A series of PEG-bP (St-co-VBC) amphiphilic copolymers with controlled molecular weight and narrow molecular weight distribution were synthesized by one-step reversible addition-fragmentation chain transfer (RAFT) The synthesized block copolymers were characterized by GPC, NMR, FT-IR and DSC.The results showed that by controlling the monomer The molar ratio of chloromethyl styrene (VBC) to styrene (St) in the body allows precise control of the VBC repeat units in the amphiphilic block copolymer PEG-bP (St-co-VBC) With the increase of VBC content in block copolymer, the glass transition temperature of PEG-bP (St-co-VBC) gradually increased.