writer：Xiaoyan Qiu1,Jize Liu1,Xinkai Li1,Yuyan Wang2 &Xinxing Zhang 1
keywords：Click dechlorination，Recyclable vitrimers
source：期刊
Issue time：2024年

Amid the ongoing Global Plastics Treaty, high-quality circulation of halogen-

containing plastics in an environmentally sound manner is a globally pressing

issue. Current chemical dechlorination methods are limited by their inability

to recycle PVC at the long-chain carbon level and the persistence of eco-toxic

organochlorine byproducts. Herein, we propose a click dechlorination strat-

egy for transforming waste PVC into valuable vitrimers via a one-step cascade

thiol-ene click reaction and dynamic polymerization. Thermal activation of

C-Cl bonds initiates β-elimination dechlorination, while disul?de bonds syn-

chronously undergo homolytic cleavage, generating sulfur-centered radicals

that drive precise sulfur-chlorine substitution and the formation of disul?de

dynamic networks. This strategy achieves nearly complete chlorine extraction

(93.88%) and produces vitrimers with tailorable mechanical and reprocessing

properties, spanning from soft elastomers with 784% elongation to rigid

plastics with a yield strength of 34 MPa. The signi?cant advantage of this

strategy is backbone protective precisedechlorination, enabling ecosystem

toxicity reduced by 99.51% compared with widely adopted pyrolysis methods.

This work introduces a sustainable pathway for upcycling PVC into valuable

materials, marking signi?cant progress in chlorinated plastic recycling.