Manipulating Recyclable Epoxy Vitrimer With Superior Thermal and Mechanical Performance via Multiple Dynamic Imine Enhancement

An efficient method for introducing dynamic imine bonds into epoxy resins has been developed, resulting in a dynamic network that does not require specialized curing agents. The vanillin-based dynamic epoxy resin demonstrates excellent thermal, mechanical, and electrical properties. Additionally, a dynamic epoxy resin based on 4-hydroxyterephthalaldehyde has been designed, further enhancing these properties through increased imine bond content, which elevates the glass transition temperature (T_g), dynamic characteristics, and mechanical strength, while preserving insulating capabilities. Both the vanillin-based and high imine-content dynamic epoxy resins exhibit successful mechanical and chemical recyclability. Overall, the dynamic epoxy resins, with their combination of high performance and recyclability, are promising candidates for environmentally sustainable applications and lay a foundation for the development of fully recyclable composite materials.