Fabrication and performances of itaconic acid-based epoxy vitrimers with high mechanical properties
Itaconic acid-based epoxy vitrimers with dual-dynamic covalent bonds (boronic ester bond and ester bond) were fabricated by epoxy-carboxylic acid reaction,itaconic acid derivative as an epoxy monomer,synthesized tricarboxylic acid compound as crosslinker.The structures of the itaconic acid-based epoxy vitrimer and tricarboxylic acid compound were characterized by fourier transform infrared (FT-IR) spectra and proton nuclear magnetic resonance (1H NMR) spectroscopy,and the results show that all of them are successfully prepared.Meanwhile,the mechanical properties,thermal stability,thermo-mechanical properties and stress relaxation testing of the EIA-HBN were examined by tensile testing,thermogravimetric analysis (TG),and dynamic mechanical analysis (DMA),and the effects of HBN content on the network properties were studied.Furthermore,the effects of HBN content on self-healing and chemical recycling performances of all the itaconic acid-based epoxy vitrimer networks were researched;the results displayed that the EIA-HBN-6 network possess the excellent self-healing and chemical recycling capabilities.
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