共聚物
单体
聚合
高分子化学
催化作用
块(置换群论)
组合化学
高分子
碳酸三甲烯
化学
有机化学
聚合物
几何学
数学
生物化学
作者
Yang Zhang,Chenyang Hu,Fengchao Cui,Xuan Pang,Yuezhou Huang,Yucun Zhou,Xuesi Chen
标识
DOI:10.1002/anie.202117533
摘要
The switchable catalysis using a commercial salenMn catalyst was firstly developed and applied in the one-pot selective copolymerization from anhydrides, epoxides, CO2 and ϵ-caprolactone (ϵ-CL) mixtures for the precise synthesis of AB, ABA and novel ABC block copolymers. The observed unique double switch process comprising three different polymerization cycles was rationalized by theoretical calculations. Surprisingly, the first block turned out to be an efficient macromolecular initiator for the consecutive introduction of carbonate linkages into copolymers, albeit with dominant cyclization with the catalyst alone. Further, through the selective reaction on different epoxides, the switchable copolymerization of up to five monomers was achieved yielding well-defined multi-block copolymers with structural diversity and functionality.
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