Correlation of Electrophysical and Mechanical Properties of Polymer Nanocomposites Based on Epoxy Resin with Carbon Fibers

Composite materials based on epoxy resin filled with carbon fibers and glass fabric was produced by vacuum pressing method. The dependences of the electrophysical characteristics
$(\ \varepsilon^{\ \ \prime}, \varepsilon^{\ \ \prime\prime}\,\ \sigma)$
on the content of carbon fibers in the composite was obtained. Significant change in the concentration dependences of the electrical conductivity at low frequencies, as well as the real and imaginary components of the complex permittivity at a frequency of 9 GHz of composites in the range of 0.001-0.005 of the volume fraction of CF is observed. The influence of the amount of filler in the composite on the strength characteristics was investigated. The shift of percolation threshold to the region of low values during application of filled epoxy resin to glass fabrics was found. The value of the percolation threshold in composites correlates with the filler content at which the maximum strength characteristics are achieved.