解聚
聚酯纤维
乙二醇
催化作用
单体
聚合物
高分子化学
有机化学
乙烯
材料科学
化学
作者
Connor F. Gallin,Won Woo Lee,Jeffery A. Byers
标识
DOI:10.1002/anie.202303762
摘要
Abstract The ability to efficiently and selectively process mixed polymer waste is important to address the growing plastic waste problem. Herein, we report that the combination of ZnCl 2 and an additive amount of poly(ethylene glycol) under vacuum can readily and selectively depolymerize polyesters and polycarbonates with high ceiling temperatures ( T c >200 °C) back to their constitute monomers. Mechanistic experiments implicate a random chain scission mechanism and a catalyst structure containing one equivalent of ZnCl 2 per ethylene glycol repeat unit in the poly(ethylene glycol). In addition to being general for a wide variety of polyesters and polycarbonates, the catalyst system could selectively depolymerize a polyester in the presence of other commodity plastics, demonstrating how reactive distillation using the ZnCl 2 /PEG600 catalyst system can be used to separate mixed plastic waste.
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