Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 17, Pages 4862-4866Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201701438
Keywords
carbon dioxide; depolymerization; polycarbonates; recyclable polymers; temperature switch
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Funding
- National Natural Science Foundation of China (NSFC) [21690073, 21504011]
- Specialized Research Fund for the Doctoral Program of Higher Education (SREDP) [20130041130004]
- Chang Jiang Scholars Program from the Ministry of Education of China [T2011056]
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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.
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