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论文类型：期刊论文

发表时间：2017-04-18

发表刊物：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录刊物：SCIE、EI、PubMed

卷号：56

期号：17

页面范围：4862-4866

ISSN号：1433-7851

关键字：carbon dioxide; depolymerization; polycarbonates; recyclable polymers; temperature switch

摘要：It is of great significance to depolymerize used or waste polymers to recover the starting monomers suitable for repolymerization reactions that reform recycled materials no different from the virgin polymer. Herein, we report a novel recyclable plastic: degradable polycarbonate synthesized by dinuclear chromium-complex-mediated copolymerization of CO2 with 1-benzyloxycarbonyl-3,4-epoxy pyrrolidine, a meso-epoxide. Notably, the novel polycarbonate with more than 99% carbonate linkages could be recycled back into the epoxide monomer in quantitative yield under mild reaction conditions. Remarkably, the copolymerization/ depolymerization processes can be achieved by the ON/OFF reversible temperature switch, and recycled several times without any change in the epoxide monomer and copolymer. These characteristics accord well with the concept of perfectly sustainable polymers.