共聚物
选择性
氧化环己烯
化学
高分子化学
催化作用
聚碳酸酯
聚合物
环己烯
有机化学
作者
Jinbo Zhang,Lebin Wang,Shaofeng Liu,Zhibo Li
标识
DOI:10.1002/ange.202111197
摘要
Abstract Organophosphazenes combined with triethylborane (TEB) were selected as binary organocatalyts for the copolymerization of CO 2 and epoxides. Both the activity and selectivity were highly dependent on the nature of phosphazenes. 2,4,6‐Tris[tri(1‐pyrrolidinyl)‐iminophosphorane]‐1,3,5‐triazine (C 3 N 3 ‐Py‐P 3 ) with a relatively low basicity (p K a =26.5 in CD 3 CN) and a bulky molecular size ( φ =1.3 nm) exhibited an unprecedented efficiency (TON up to 12240) and selectivity (>99 % polymer selectivity and >99 % carbonate linkages) toward copolymerization of CO 2 and cyclohexene oxide (CHO), and produced CO 2 ‐based polycarbonates (CO 2 ‐PCs) with high molar masses ( M n up to 275.5 kDa) at 1 MPa of CO 2 and 80 °C. Surprisingly, this binary catalytic system achieved efficient CO 2 /CHO copolymerization with TOF up to 95 h −1 at 1 atm pressure and room temperature.
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