Closed-Loop Polymer Upcycling by Installing Property-Enhancing Comonomer Sequences and Recyclability
Closed-Loop Polymer Upcycling by Installing Property-Enhancing Comonomer Sequences and Recyclability
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DOI：
10.1021/acs.macromol.9b00817
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发表时间：
2019-06
期刊：
影响因子：
5.5
通讯作者：
Xia Liu;Miao Hong;L. Falivene;L. Cavallo;E. Chen
中科院分区：
文献类型：
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作者：
Xia Liu;Miao Hong;L. Falivene;L. Cavallo;E. Chen
将消费后塑料升级为更高价值产品的概念很有吸引力，但挑战仍然是开发具有成本效益的升级循环计划，发现性能增强结构，最重要的是，将可回收性安装到升级循环塑料中，以实现循环生命周期。本文报道了一种方便且有效的策略，用于通过在生物衍生的市售γ-丁内酯（BL）中的酯交换（TEster）来升级聚酯，例如聚（乙醇酸）（PGA），所述γ-丁内酯（BL）用作溶剂和共聚单体，其产生序列限定的共聚物聚（GA-co-BL）。由于TEster独特地产生的共聚物中存在的分离的乙醇酸序列，它表现出比不含此类序列的均聚物或共聚物更高的热稳定性（≥44 °C）。这种上转化的共聚物是化学可回收的，能够完全回收纯乙醇酸和BL原料。
The concept of upcycling postconsumer plastics into higher-value products is attractive, but the challenges remain to develop a cost-effective upcycling scheme, discover property-enhancing structures, and, most importantly, install recyclability into upcycled plastics to enable a circular lifecycle. Reported herein is a convenient and effective strategy to upcycle polyester, exemplified by poly(glycolic acid) (PGA), via transesterification (TEster) in bioderived, commercially available γ-butyrolactone (BL) that serves as both the solvent and comonomer, which generates sequence-defined copolymer poly(GA-co-BL). Owing to the isolated glycolic sequence present in the copolymer created uniquely by TEster, it exhibits much-enhanced thermal stability (≥44 °C) over both homopolymers or copolymers without such sequences. This upconverted copolymer is chemically recyclable, enabling a complete recovery of pure glycolic acid and BL feedstocks.