【摘要】 以二硫代枯酯(CDB)为链转移剂,AIBN作为引发剂,用可逆加成-断裂链转移(RAFT)活性自由基聚合方法制备了高分子量窄分布的PS聚合物,其重均分子量可达到-Mw=465 000 g/mol,数均分子量达到-Mn=333 000 g/mol,分布指数D=1.40。考察了链转移剂浓度、聚合温度和聚合时间对PS聚合物的分布指数和分子量的影响,此方法制得的PS聚合物能满足工程材料的要求。更多还原

【Abstract】 High molecular weight polystyrene(PS) polymers with low polydispersity were successfully synthesized by reversible addition-fragmentation chain transfer(RAFT)polymerization using cumyl dithiobenzoate(CDB)as transfer agent,AIBN as initiator.The optimization was weight average-molecular weight(w) 465 000 g/mol,number-average molecular weight(n) 333 000 g/mol and polydispersity index(PDI)1.40.Influence of the chain transfer agent concentration,polymerization temperature and reaction time on the polydispersity and molecular weight was studied.The PS polymers prepared by RAFT method are able to meet requirement of engineering material.更多还原