ArticlePolymers2026
Dynamic Imine-Linked NIPU with Shape Memory, Self-Healing, and Prospects for Recyclability.
Article in Polymers, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Non-isocyanate polyurethanes (NIPUs) incorporating dynamic imine linkages were developed via UV-induced photopolymerization of methacrylated monomers. The system combines a non-isocyanate urethane (NIU) precursor derived from cyclic carbonate chemistry with an imine-containing (Vit) monomer obtained via Schiff base formation, enabling compositionally tunable networks with a high gel content (90-97 wt%) and thermal stability up to >190 °C. The increase in NIU content enhances network rigidity, varying the glass transition temperatures from 29.3 °C to 73.4 °C. The dynamic imine chemistry imparts outstanding multifunctionality, including efficient shape memory behavior, thermally triggered reprogrammability, and rapid surface self-healing behavior, even at a low content of imine-containing precursor (30 wt%). The optimized composition further provides a proof-of-concept of selective chemical depolymerization for monomer recovery. These results establish NIU-Vit networks as versatile, having recyclability prospects, and a multifunctional platform for sustainable polymers as replacements for the traditional isocyanate-based polyurethanes.
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