Electrical characteristics of different concentration of silica nanoparticles embedded in epoxy resin

Abstract

To improve the electrical and mechanical properties of epoxy resin for their wide scope of applications, a modified epoxy nanocomposite was produced in this study by incorporating SiO2 nanoparticles of 15-30 nm in size.The electric properties of epoxy nanocomposite at room temperature at a frequency range of 10-2 – 107 Hz were examined. To determine the impact of nanoparticles on the epoxy composition, the epoxy composite was evaluated by scanning electron microscopy- energy dispersive X-ray spectroscopy, fourier transform infrared spectra, and raman spectra . The epoxy with 15 wt.% of SiO2 nanoparticles samples had a lower permittivity, loss number, conductivity, and capacitance than the unfilled epoxy. While it has a higher impedance and modulus than the unfilled epoxy. Accordingly, the effect of immobilized layers and the effect of the Lichtenecker-Rothe logarithmic mixing rule on the electrical and mechanical properties were clarified.

Electrical properties of epoxy/graphite flakes microcomposite at the percolation threshold concentration

“…The peak at 1382 cm −1 can be assigned to the stretching of CO and bending of OH groups, indicative of the presence of oxygen-containing functional groups. However, the band at 1017 cm −1 is associated with COC in epoxy groups [8,17,22]. The faint bands at 1670 cm −1 indicate the presence of amine N-H functional groups.…”

“…Additionally, the bands at 2957 and 2875 cm −1 assigned to the -CH 2 and -CH 3 stretching vibration modes of aromatic and aliphatic chains, respectively. Furthermore, the band observed at 3065 cm −1 is assigned to the C-H stretching mode of the epoxide group [8,17]. The peak at 1382 cm −1 can be assigned to the stretching of CO and bending of OH groups, indicative of the presence of oxygen-containing functional groups.…”

“…The even distribution of the filler within the polymer matrix is a fundamental challenge in sample preparation. Previous literature has presented different methods for sample preparation [8,[16][17][18]. However, we have chosen the method that we believe to be the most suitable, ensuring the effective dispersion of the microfiller within the epoxy.…”

“…Additionally, the peaks at 1105 and 1560 cm −1 signify the existence of imide C-N bonds [23]. The band at 830 cm −1 is ascribed to the out-of-plane bending of the H-C = vibration present in maleimide rings [17,22,24,25]. Furthermore, the bands situated at 570 cm −1 and 465 cm −1 are assigned to the out-ofplane transmittance of C-H in aromatic rings and Cl-C [21,24], respectively.…”

“…The recorded experimental data was analyzed using the Havriliak-Negami (HN) theory, a well-established method for describing the dielectric properties and relaxation behaviour of materials in the frequency domain. The HN equation for complex permittivity is a commonly used function in this context and can be expressed as follows [17,[26][27][28]:…”