High-Performance Epoxy Vitrimers with the Joint Action of Dual Dynamic Covalent Bonds AITranslate

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DOI：https://doi.org/10.1021/acsapm.3c01738

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Epoxy vitrimers have attracted increasing research attention owing to their stable physical properties, reprocessability, recyclability, and degradability. Among them, rapid self-healing can be achieved in dual dynamic covalent epoxy vitrimers. However, research on the performance and high-strength surface welding of dual dynamic covalent epoxy vitrimers with flexibility is still insufficient. Herein, we report a dual dynamic covalent epoxy vitrimer cocross-linked by dimer acid (DAA) and 3,3′-dithiodipropionic acid (DTDA), named E51-DAAx-DTDAy. The results suggest that the stress relaxation and self-healing speed of vitrimers is improved and the mechanical properties can be restored by 81.2% after 24 h of healing. Additionally, significant recyclability is found in E51-DAAx-DTDAy, with a maximum recovery rate of 119.4% in tensile strength and 124.8% in elongation at break after three times of recycling. Furthermore, Tv of E51-DAAx-DTDAy was above 140 °C; meanwhile, E51-DAAx-DTDAy had better insulation properties, making them more suitable for use as thermosetting materials at moderate temperatures in electronic equipment. E51-DAAx-DTDAy can be recycled by chemical reagents, and green cycling can be achieved. These are attributed to the contributions of disulfide bonds and hydroxyl ester bonds in the network topology.