Chaogang Fan, Qingyun Ge, Shujuan Lu, Xianshe Feng, Yingfeng Tu, Li Jia, Shaohui Lin, Qinmin Pan, Flora T. T. Ng
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One-Pot Synthesis of Polycarbonate-b-Polyester Block Copolymers From CO2/Epoxide/ε-Caprolactone Catalyzed by Salen-Cobalt(III) Complex
A Salen-Co(III)-Cl catalyzed copolymerization strategy is developed for the controlled synthesis of polycarbonate-b-polyester block copolymers through a one-pot process involving CO2, 4-vinyl-1-cyclohexene-1,2-epoxy (VCHO), and ε-caprolactone (ε-CL). This procedure is extended to the copolymerization of CO2, VCHO, and lactide. The catalytic system is designed and optimized with temperature and CO2 acting as triggers to switch between CO2/epoxide copolymerization and ε-CL homopolymerization. In addition, introducing water as the chain transfer agent reduced the polydispersity index (PDI) of the block copolymers. The copolymer composition can be controlled by adjusting the concentration ratio of epoxides and ε-CL, yielding copolymers with carbonate molar ratios ranging from 14% to 67%. The block copolymers exhibit enhanced thermal stability, and the glass transition temperature (Tg) can be controlled by adjusting the block composition.
期刊介绍：
Journal of Polymer Research provides a forum for the prompt publication of articles concerning the fundamental and applied research of polymers. Its great feature lies in the diversity of content which it encompasses, drawing together results from all aspects of polymer science and technology.
As polymer research is rapidly growing around the globe, the aim of this journal is to establish itself as a significant information tool not only for the international polymer researchers in academia but also for those working in industry. The scope of the journal covers a wide range of the highly interdisciplinary field of polymer science and technology.
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