Covalent adaptable polymer networks with CO2-facilitated recyclability

Jiayao Chen, Lin Li, Jiancheng Luo, Lingyao Meng, Xiao Zhao, Shenghan Song, Zoriana Demchuk, Pei Li, Yi He, Alexei P. Sokolov and Peng-Fei Cao ()
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Jiayao Chen: Beijing University of Chemical Technology
Lin Li: Beijing University of Chemical Technology
Jiancheng Luo: Oak Ridge National Laboratory
Lingyao Meng: Oak Ridge National Laboratory
Xiao Zhao: GCP Applied Technologies
Shenghan Song: University of New Mexico
Zoriana Demchuk: Oak Ridge National Laboratory
Pei Li: Beijing University of Chemical Technology
Yi He: University of New Mexico
Alexei P. Sokolov: Oak Ridge National Laboratory
Peng-Fei Cao: Beijing University of Chemical Technology

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Cross-linked polymers with covalent adaptable networks (CANs) can be reprocessed under external stimuli owing to the exchangeability of dynamic covalent bonds. Optimization of reprocessing conditions is critical since increasing the reprocessing temperature costs more energy and even deteriorates the materials, while reducing the reprocessing temperature via molecular design usually narrows the service temperature range. Exploiting CO2 gas as an external trigger for lowering the reprocessing barrier shows great promise in low sample contamination and environmental friendliness. Herein, we develop a type of CANs incorporated with ionic clusters that achieve CO2-facilitated recyclability without sacrificing performance. The presence of CO2 can facilitate the rearrangement of ionic clusters, thus promoting the exchange of dynamic bonds. The effective stress relaxation and network rearrangement enable the system with rapid recycling under CO2 while retaining excellent mechanical performance in working conditions. This work opens avenues to design recyclable polymer materials with tunable dynamics and responsive recyclability.

Date: 2024
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DOI: 10.1038/s41467-024-50738-7

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