Hydrogen-Bonding Mediated Cosolvency: Boosting Facile and Rapid Depolymerization of Epoxy Thermosets

Thermosetting polymers feature highly cross-linked networks that are fundamentally distinct from those of thermoplastics. Even with similar cross-linking point, their three-dimensional architecture imposes significant mass transfer barriers and necessitates harsh, energy-intensive degradation conditions. Overcoming these limitations to achieve efficient and low-energy recycling of epoxy thermosets remains a major challenge. To address this challenge, this article developed a cosolvent-enhanced diethylenetriamine (DETA) catalytic system that enables rapid and efficient degradation under mild conditions. This approach achieved complete decomposition within 30 min at 60°C, significantly reducing time and energy consumption compared to conventional methods. The cosolvents accelerate degradation by disrupting the resin morphology to enhance mass transport and activating the amine catalyst through hydrogen-bonding interactions. This article provides a practical and sustainable pathway for recycling of thermosetting polymers, highlighting the potential of solvent-catalyst synergy in promoting circular polymer economies.