美国密歇根大学McNeil Anne J.团队报道了利用废聚氯乙烯通过增塑剂介导的电脱氯法合成氯芳烃。相关研究成果发表在2022年11月14日出版的《自然—化学》。

需要新的方法来减少和再利用塑料垃圾。在这种情况下，聚氯乙烯（PVC）是一个很有吸引力的目标，因为它是回收率最低的高产量聚合物，且容易释放增塑剂和腐蚀性HCl气体。

该文中，这些限制在成对电解反应中变得有利，其中在由增塑剂介导的耐空气和潮湿过程中，有意地从PVC生成HCl以氯化芳烃。该反应与存在的其他塑料废物有效地进行，并且可以直接使用商业塑化PVC产品（实验室管）。一项简化的生命周期评估表明，在配对电解反应中使用PVC废料作为氯源，其全球变暖潜力低于HCl。

总的来说，这种方法能够启发其他利用电合成反应重新利用废PVC和相关聚合物的策略，包括那些利用现有聚合物添加剂的策略。

附：英文原文

Title: Using waste poly(vinyl chloride) to synthesize chloroarenes by plasticizer-mediated electro(de)chlorination

Author: Fagnani, Danielle E., Kim, Dukhan, Camarero, Sofia I., Alfaro, Jose F., McNeil, Anne J.

Issue&Volume: 2022-11-14

Abstract: New approaches are needed to both reduce and reuse plastic waste. In this context, poly(vinyl chloride) (PVC) is an appealing target as it is the least recycled high-production-volume polymer due to its facile release of plasticizers and corrosive HCl gas. Herein, these limitations become advantageous in a paired-electrolysis reaction in which HCl is intentionally generated from PVC to chlorinate arenes in an air- and moisture-tolerant process that is mediated by the plasticizer. The reaction proceeds efficiently with other plastic waste present and a commercial plasticized PVC product (laboratory tubing) can be used directly. A simplified life-cycle assessment reveals that using PVC waste as the chlorine source in the paired-electrolysis reaction has a lower global warming potential than HCl. Overall, this method should inspire other strategies for repurposing waste PVC and related polymers using electrosynthetic reactions, including those that take advantage of existing polymer additives.

DOI: 10.1038/s41557-022-01078-w

Source: https://www.nature.com/articles/s41557-022-01078-w