A Simple, Selective, and General Catalyst for Ring Closing Depolymerization of Polyesters and Polycarbonates for Chemical Recycling.
A Simple, Selective, and General Catalyst for Ring Closing Depolymerization of Polyesters and Polycarbonates for Chemical Recycling.
复制标题
用于聚酯和聚碳酸酯闭环解聚的简单、选择性和通用催化剂，用于化学回收。
DOI：
10.1002/anie.202303762
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Byers,JefferyA
中科院分区：
文献类型：
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作者：
Gallin,ConnorF;Lee,Won-Woo;Byers,JefferyA
高效和有选择地处理混合聚合物废物的能力对于解决日益增长的塑料废物问题非常重要。在此，我们报道了在真空条件下，将氯化锌和一定量的聚乙二醇合在一起，可以很容易地、选择性地将具有较高上限温度(TC>；200 °C)的聚酯和聚碳酸酯解聚回它们组成的单体。力学实验表明，聚乙二醇中的每个乙二醇重复单元含有一种相当于一种氯化锌的催化剂结构和随机断链机制。除了对各种聚酯和聚碳酸酯具有通用性外，该催化剂体系还可以在其他商品塑料存在的情况下选择性地解聚聚酯，展示了使用ZnCl2/PEG600催化剂体系的反应蒸馏如何用于分离混合塑料废物。
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 ZnCl2and an additive amount of poly(ethylene glycol) under vacuum can readily and selectively depolymerize polyesters and polycarbonates with high ceiling temperatures (Tc>200 °C) back to their constitute monomers. Mechanistic experiments implicate a random chain scission mechanism and a catalyst structure containing one equivalent of ZnCl2per 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 ZnCl2/PEG600 catalyst system can be used to separate mixed plastic waste.