Synthesis shows improved fracture toughness and thermal conductivity in epoxy resin, highlighting its liquid crystalline characteristics.
The epoxy monomer N,1-bis(4-(2-oxiranemethoxy)phenyl)methylamine (HBAP-EP) was synthesized through the Schiff base reaction and epichlorohydrin method, and the HBAP-EP monomer was cured using p-aminobenzene sulfonamide (SAA). Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and polarizing optical microscopy (POM) demonstrated that the epoxy monomer exhibits reversible liquid crystal properties, and the liquid crystal fraction of the monomer can reach 14.4% after curing at 120 °C. The fracture toughness of the resin cured at 120 °C can reach 0.93 KJ·m−2, and its thermal conductivity is 0.3229 W·(m·K)−1, both of which are higher than those of ordinary epoxy resin.
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Huang et al. (2025) studied this question.
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