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氧杂环类单体的阳离子开环聚合是通过单体中氧原子对活性种的亲核进攻实现,但若聚合体系内存在羟基则会存在另一种链增长机理,即活化单体(AM)增长机理。长期以来,学者们的研究重点主要集中在活性链(ACE)增长机理上,随着理论研究的深入以及测试技术的发展,AM机理才被提出。本文综述了AM增长机理在氧杂环单体阳离子开环聚合过程中存在的依据,以及近年来运用氧杂环单体在阳离子开环聚合过程中的AM增长机理,制备嵌段、星型和超支化聚合物的研究进展。
Cationic ring-opening polymerization of oxacyclic monomers is achieved by the nucleophilic attack of the active species by the oxygen atoms in the monomer, but another mechanism of chain growth exists if hydroxyl groups are present in the polymerization system, ie, the activation monomer (AM Growth mechanism. For a long time, scholars mainly focus on the growth mechanism of activity chain (ACE). With the deepening of theoretical research and the development of testing technology, AM mechanism was proposed. This review summarizes the evidence of the existence of AM growth mechanism during the ring-opening polymerization of oxygen-containing monocyclic cations, as well as the mechanism of AM growth during the cationic ring-opening polymerization using oxygen-heterocyclic monomers in recent years. The preparation of block, star and Research Progress in Hyperbranched Polymers.