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Thiswork presents a straightforward strategy to introduce highlydynamic and adaptable cross-links into common epoxy resin formulations.For this, an oligomeric amine-based curing agent containing vinylogousurethane (VU) bonds was developed. This novel polyfunctional aminecuring agent can be used as a drop-in solution for existing epoxyresin technologies, resulting in transparent, rigid, and, at the sametime, highly reprocessable catalyst-free epoxy vitrimers. The oligomericVU-curing agents are prepolymerized via a straightforward condensationreaction between acetoacetates extended with different classical aminemonomers and epoxy hardeners. It is found that vitrimer propertiescan be readily introduced into these epoxy formulations by convertingu003c50 mol % of the hardener’s amine functionalities into dynamicvinylogous urethane bonds. In this way, epoxy vitrimers can be obtainedwith material properties comparable to ones of the VU-free epoxy formulations.In addition, remarkably short processing times are observed in theabsence of any catalyst, and the material displayed very short stressrelaxation times and good recyclability, actually representing themost performant VU-based vitrimers so far. Furthermore, a proof ofconcept for its use in obtaining glass-fiber-reinforced epoxy compositesis also presented.

Dynamic Curing Agents for Amine-Hardened Epoxy Vitrimers with Short (Re)processing Times