化工学报2017，Vol.68Issue(6)：2569-2576,封2,9.DOI:10.11949/j.issn.0438-1157.20170011
可逆加成-断裂链转移聚合制备聚氯乙烯-b-聚乙二醇-b-聚氯乙烯共聚物
Synthesis of poly(vinyl chloride)-b-poly(ethylene glycol)-b-poly(vinyl chloride) block copolymers by reversible addition-fragmentation chain transfer polymerizations
摘要
Abstract
Poly(ethylene glycol) terminated with xanthate (X-PEG-X) was synthesized and used as the reversible addition-fragmentation chain transfer (RAFT) agent for controlling vinyl chloride (VC) solution and suspension polymerizations to synthesize poly(vinyl chloride)-b-poly(ethylene glycol)-b-poly(vinyl chloride) (PVC-b-PEG-b-PVC) triblock copolymers. Results show that the molecular weights (MW) of block copolymers prepared by the solution polymerization are increased with the polymerization conversion, and the molecular weight distribution (MWD) index is lower than 1.65. X-PEG-X is amphiphilic and can effectively reduce the interfacial tension between water and oil. Thus, a novel VC RAFT suspension polymerization method was proposed to prepare PVC-b-PEG-b-PVC copolymers using X-PEG-X as the RAFT agent and a suspending agent. The block copolymer particles have no surface membranes, and MW of copolymer is increased with conversion. However, the block copolymers prepared by suspension polymerization exhibit wider MWD than the block copolymers prepared by solution polymerization, due to the two-phase mechanism of VC suspension polymerization. The chain extension of PVC-b-PEG-b-PVC with vinyl acetate (VAc) further prove the "living" nature of PVC-b-PEG-b-PVC copolymers and result the formation of PVAc-b-PVC-b-PEG-b-PVC-b-PVAc copolymer. PVC-b-PEG-b-PVC copolymers exhibit better hydrophilicity than PVC.关键词
聚合物/合成/悬浮系/聚氯乙烯/聚乙二醇/可逆加成-断裂链转移聚合Key words
polymers/synthesis/suspensions/poly(vinyl chloride)/poly(ethylene glycol)/reversible addition- fragmentation chain transfer polymerization分类
化学化工引用本文复制引用
黄志辉,包永忠,潘鹏举..可逆加成-断裂链转移聚合制备聚氯乙烯-b-聚乙二醇-b-聚氯乙烯共聚物[J].化工学报,2017,68(6):2569-2576,封2,9.基金项目
国家自然科学基金(21676235).supported by the National Natural Science Foundation of China(21676235). （21676235）
