Sustainable development is an important factor to consider in today's social and economic development. In the field of polymers, a large amount of polymer waste is generated due to problems such as non-degradable polymers or poor degradation selectivity. In general, polymer degradation conditions are very harsh, such as high temperature, high pressure, etc., resulting in a low yield of the original monomer obtained. How to degrade waste polymers into virgin monomers is a challenging problem.
Dalian University of Technology, State Key Laboratory of Fine Chemicals, "Small Molecule Activation and Biomimetic Catalysis", Ministry of Education, Innovation Team, Professor Lu Xiaobing, Associate Professor Liu Ye, associates a new type of alkylene oxide monomer, which can be combined with CO2 in a dual-core metal catalyst. Alternating copolymerization occurs under the action to obtain a recyclable polycarbonate plastic. At 100oC, this polycarbonate plastic can be completely converted to alkylene oxide monomer with a conversion yield and selectivity higher than 99%; moreover, the reversible process of polymerization/degradation can be controlled by temperature. After repeated recycling, neither the epoxy monomer nor the properties of the polymer will change. This is the first time that CO2 copolymers can be completely reused, in line with the requirements of the concept of sustainable polymer development. The research results are published in the "Completely Recyclable Monomers and Polycarbonate: Approach to Sustainable Polymers" and published in the top international journals in the field of chemistry. "Angew. Chem. Int. Ed." and was selected by the magazine as Hot Paper.
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