Effect of structural and morphological features of a nanocarbon component on electrophysical properties of fluoroplastic composite materials

This work studies placement and contact features of thermally exfoliated graphite (TEG) particles with different dispersion levels under compression and analyzes the effect of the carbon filler’s morphology on the electrophysical properties of nanocomposite materials (NCMs) with fluoroplastic. The electric resistance and dielectric permittivity of NCMs were studied using four-, threeand two-electrode circuits. It has been found experimentally that the percolation threshold calculated by the concentration dependences of the electric resistance values is shifted towards the region of lower filler concentrations from 12.5 to 5.2 vol % with an increase in the mean value of the cross sections of TEG particles from 40 to 500 μm. These data were used to find the critical t indices for nanocomposites and to establish the laws of formation of a current-conducting cluster in a polymer matrix. It has also been shown that a decrease in the dispersion level of the carbon component in NCMs affects the polarization processes of its particles and leads to higher dielectric permittivity. © 2015, Allerton Press, Inc.