Thermomechanical and dielectric properties relationship of hybrid carbon black and nano silica epoxy composites

Multifunctional materials refer to the types of materials that possess enhanced mechanical, electrical, and thermal properties. In this work, nano silica and Carbon Black (CB) are added to epoxy polymer as an improve the thermomechanical and dielectric properties of the composites. Filler loadings are varied from 0.1 wt.%, up till 5 wt.%. The thermomechanical properties are measured from Dynamic Mechanical Thermal Analysis (DMTA) while the dielectric properties are measured from Vector Network Analyser (VNA). The synergistic effects of combining both fillers (keeping them at 1:1 wt.% ratio) are also assessed. It was found that the value of glass transition temperature, Tg,increased from 56.85'C (neat epoxy) to 59.8'C (5 wt.% CB). The Tq values furher increased to 64.7'C, for 5 wt.% hybrid fillers (2.5 wt.% silica + 2.5 wt.% CB), demonstrating the synergistic effects by employing dual fillers. By adding single and dual fillers, the values os storage Modulus, E' remains almost constant for both glassy (40'C) and rubbery region (100'C), regardless of the loading employed. The values of real permittivity, 3' was also measured for dual fillers in the frequency range between 300 kHz to 18 GHz. The highest value of 3' was 5.5 F/m, which was measured for both 1.5 mm and 2.0 mm sample thickness of 5 wt.% hybrid fillers (2.5 wt.% silica + 2.5 wt.% CB). This study highlights the thermomechanical and dielectric properties improvement of epoxy composities by incorporating dual fillers.