Depolymerizable Thermosetting Dielectric Elastomers Toughened by Sacrificial Hydrogen Bonds for Sustainable Capacitive Strain‐Sensor

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Abstract
The development of sustainable capacitive strain‐sensors necessitates dielectric elastomers that integrate mechanical robustness and closed‐loop recyclability. Herein, a self‐healing thermosetting elastomer (PIT) is designed that simultaneously achieves depolymerizability and high toughness through a dual‐crosslinking architecture combining triazine‐based dynamic covalent linkages and supramolecular hydrogen bonds. The dynamic nucleophilic aromatic substitution enables closed‐loop chemical recycling, while the sacrificial hydrogen bonding dissipates energy to enhance mechanical toughness. The electron‐deficient triazine structure confers enhanced dielectric properties (κ = 5.94 at 100 kHz), surpassing common silicone‐based counterparts (e.g., silicon rubber, κ500 cycles), and full‐component recyclability. Real‐time human motion monitoring validates practical functionality, while controlled depolymerization regenerates pristine materials for sensor re‐fabrication. This work presents a material design paradigm and sustainable manufacturing strategy for eco‐conscious flexible electronics.
Funding Information
  • National Key Research and Development Program of China (2022YFB3808800)
  • National Natural Science Foundation of China (52202101, 52272084)
  • Fundamental Research Funds for the Central Universities (30924010202, 2023102003)

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