# Synthesis and Properties Study of Liquid Crystalline Epoxy Resin Containing Azomethine-Based Monomeric Mesogens

## TL;DR

This paper reports the synthesis of a liquid crystalline epoxy resin with improved properties like toughness and thermal conductivity.

## Contribution

A novel epoxy resin containing azomethine-based mesogens was synthesized and shown to have enhanced mechanical and thermal properties.

## Key findings

- The epoxy monomer exhibits reversible liquid crystal properties with a 14.4% liquid crystal fraction after curing at 120 °C.
- The resin's fracture toughness and thermal conductivity are higher than those of ordinary epoxy resins.
- DSC, XRD, and POM confirmed the liquid crystalline behavior of the synthesized monomer.

## Abstract

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.