Abstract
AbstractA novel keto‐ene containing phthalonitrile (PN) monomer was synthesized and characterized by Fourier transform infrared spectroscopy (FT‐IR) and 1H and 13C nuclear magnetic resonance spectroscopy. Graphene oxide (GO) was prepared from natural graphite using Hummer's method. The effect of the addition of GO with diglycidyl ether of bisphenol A (DGEBA) and phthalonitrile in the presence of diaminodiphenyl sulfone (DDS) as a curing agent has been investigated. The mechanical, thermal, and electrical properties of GO/epoxy‐phthalonitrile (EP‐PN) nanocomposites as a function of different weight percentage of GO (0, 1, 3, and 5 wt%) are reported. Dynamic mechanical analysis reveals that a maximum glass transition temperature (166.5°C) and storage modulus (3.3 GPa at 25°C) values are obtained for 3 wt% of GO content. FT‐IR, X‐ray diffraction, and Raman spectral techniques were employed to characterize the prepared GO and its extent of exfoliation in EP‐PN nanocomposites. The dispersion of GO in the fractured surface of the composites was analyzed by scanning electron microscopy and transmission electron microscopy. GO/EP‐PN nanocomposites show dramatic increase in dielectric properties compared to the neat EP‐PN nanocomposites. All the prepared nanocomposites fabricated with GO show excellent thermal stability in nitrogen atmosphere.
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