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Dielectric properties of epoxy composites with mixed fillers including graphite nanoplatelets/BaTiO3
Authors:O. V. Lozitsky  L. L. Vovchenko  L. Y. Matzui  Y. S. Milovanov
Affiliation:1. Faculty of Physics, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine;2. Olozitsky@gmail.com;4. Institute of High Technologies, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Abstract:Abstract

The electrical properties of L285 epoxy composite materials (CMs) with a mixed filler including graphite nanoplatelets (GNP)/barium titanate(BT) at various GNP concentrations and at 35?wt.% of BT are measured using the AC impedance spectroscopy with frequencies ranging from 1?kHz to 2?MHz. The complex permittivity and its frequency dependence increase with the GNP content. The addition of a BT filler in GNP/L285?CM increases the percolation threshold in addition to a slight increase in the permittivity, allowing a higher GNP content in the composite without the formation of a conductive network. The AC conductivity increases and its dependence on the frequency decreases, as the GNP content increases.
Keywords:Polymer composites  barium titanate  graphite nanoplatelets  conductivity  permittivity
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