Abstract
In the present work, we have investigated concentration and temperature dependences of electrical conductivity of graphite nanoplatelets/epoxy resin composites. The content of nanocarbon filler is varied from 0.01 to 0.05 volume fraction. Before incorporation into the epoxy resin, the graphite nanoplatelets were subjected to ultraviolet ozone treatment at 20-min ultraviolet exposure. The electric resistance of the samples was measured by two- or four-probe method and teraohmmeter E6-13. Several characterization techniques were employed to identify the mechanisms behind the improvements in the electrical properties, including SEM and FTIR spectrum analysis.It is established that the changes of the relative intensities of the bands in FTIR spectra indicate the destruction of the carboxyl group –COOH and group –OH. Electrical conductivity of composites has percolation character and graphite nanoplatelets (ultraviolet ozone treatment for 20 min) addition which leads to a decrease of percolation threshold 0.005 volume fraction and increase values of electrical conductivity (by 2–3 orders of magnitude) above the percolation threshold in comparison with composite materials—graphite nanoplatelets/epoxy resin. The changes of the value and behavior of temperature dependences of the electrical resistivity of epoxy composites with ultraviolet/ozone-treated graphite nanoparticles have been analyzed within the model of effective electrical conductivity. The model takes into account the own electrical conductivity of the filler and the value of contact electric resistance between the filler particles of the formation of continuous conductive pathways.
Highlights
Progress in various fields of science and technology provides the creation of new materials with the required properties
The absorption spectrum for TEG contains a series of peaks and bands, two of which correspond to the impurities, namely, a wide band at 3410 cm−1 corresponding to the vibration of the bounded –OH groups
The analysis showed that the temperature dependence of the resistivity in composite materials (CMs) with a chain conductive structure (GNP/ L285 and graphite nanoplatelets (GNPs) (UV/O3)/L285) with filler concentrations of 0.023, 0.034, and 0.045 vol fr. can be described within the model of effective electrical conductivity (Eq (2))
Summary
Progress in various fields of science and technology provides the creation of new materials with the required properties These materials put high demands on strength, hardness, conductivity, heat resistance, and so on. The composite materials with carbon fillers such as graphite, carbon nanotubes, carbon fibers, carbon black, and graphite nanoplatelets (GNPs) are very popular today [1] As it is known, graphite has excellent electrical [2] and thermal conductivity [3, 4] due to its layered structure and has unique mechanical properties, with very high modulus along its graphene plane. These useful properties combined with very low cost, especially compared to carbon nanotubes, make it a popular filler to produce conducting polymers for applications in areas such as electromagnetic interference shields [5, 6] and thermal conductors
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