Click dechlorination of halogen-containing hazardous plastics towards recyclable vitrimers
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.