Abstract
AbstractA diphenylcyclohexene‐type liquid crystalline (LC) epoxy was successfully synthesized and characterized by proton nuclear magnetic resonance (1H‐NMR) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, and gel permeation chromatography (GPC). Even though the synthesized epoxy monomer showed a low melting temperature (99°C), the LC (smectic and nematic) phase was maintained over a wide temperature range of 99–184°C during the heating process. Moreover, the synthesized LC epoxy was cured with 4,4′‐diaminodiphenylmethane under four different temperature conditions. The LC phase structure, domain size, and LC fraction of the resulting epoxy thermosets were analyzed by X‐ray diffraction (XRD) and polarized optical microscopy (POM). The fracture toughness and thermal conductivity increased with an increase in the size and volume fraction of the LC domains. It was also found that the enhancement of the fracture toughness was more sensitive than that of the thermal conductivity.
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