Bio-based "thiol-epoxides" thermosets containing dynamic cross-linked network topologies, permanent cross-linking and recyclability have been successfully utilized in coatings, adhesives and composites. However, these materials typically have a low glass transition temperature and limited mechanical strength. Combining excellent mechanical properties with thermal properties remains a significant challenge. In this study, we developed a recyclable itaconic acid-based epoxy thermoset material with high glass transition temperature and tensile strength through thiol-olefin/thiolepoxy click reaction and alkyl bond radical copolymerization to construct a hybrid cross-linked network. The tensile strength reached up to (105.9 MPa) while maintaining a high T g (93.3 C), which is the highest value reported in the literature so far. In addition, the itaconic acid-based epoxy has excellent recyclable processing, selfhealing properties, high hardness, solvent resistance, and surface bond strength as an adhesive and coating. The results hold potential applications in achieving sustainable development in coatings and adhesives.borate ester bonds, hybrid cross-linked network, itaconic acid, recyclable | INTRODUCTIONConventional epoxy thermosets are difficult to recycle owing to their stable three-dimensional cross-linked networks. Current disposal methods for obsolete epoxy thermosets include crushing, burying or burning, which have caused serious environmental pollution. 1,2 Epoxy resins with dynamic covalent bonds have been shown to be an exciting and effective method for recycling or degrading thermosets. 3,4 Such as imines, 5,6 disulfides, 7 borate ester bonds, 8 and Diels-Alder adducts 9 are rapidly exchanged under specific conditions (i.e., heat, pH) to achieve recyclability. In particular, Organoboron species with the reversibility of the B-O bond, including boronic esters and boroxines, are produced from boronic acids and their cyclic analogues with 1,2-or 1,3-diols. 10 Boronic ester bonds could undergo associative
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