Yu Yan, Gao Bang, Liu Ye, Lu Xiao-Bing
State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian, 116024, China.
Angew Chem Int Ed Engl. 2022 Aug 22;61(34):e202204492. doi: 10.1002/anie.202204492. Epub 2022 Jul 14.
Chemical recycling of polymers to their constituent monomers is the foremost challenge in building a sustainable circular plastics economy. Here, we report a strategy for highly efficient depolymerization of various CO -based alicyclic polycarbonates to epoxide monomers in solvent-free conditions by a simple Cr -Salen complex mediated catalytic pyrolysis process. The chemical recycling of the widely studied poly(cyclohexene carbonate) exhibits excellent reactivity (TOF up to 3000 h , 0.1 mol % catalyst loading) and high epoxide monomer selectivity (>99 %). Mechanistic investigation reveals that the process proceeds in a sequential fashion via a trans-carbonate intermediate.
将聚合物化学循环转化为其组成单体是构建可持续循环塑料经济面临的首要挑战。在此，我们报告了一种策略，通过简单的Cr-Salen配合物介导的催化热解过程，在无溶剂条件下将各种CO基脂环族聚碳酸酯高效解聚为环氧化物单体。广泛研究的聚（环己烯碳酸酯）的化学循环表现出优异的反应活性（TOF高达3000 h，催化剂负载量为0.1 mol%）和高环氧化物单体选择性（>99%）。机理研究表明，该过程通过碳酸酯中间体以连续方式进行。
