Abstract
We have investigated the electrical properties of carbon black (CB) loaded in ethylene butylacrylate copolymer composite (EBA) in the frequency range between 102 and 104 Hz and temperature range between 153 and 353 K. The frequency dependence of electrical data that have been analyzed in two frameworks: the electrical modulus formalism with the Kohlrausch-Williams-Watts stretched exponential function (KWW) and the electrical conductivity by using the Jonscher’s power law in the frequency domain. The stretching exponent βKWW and n are found to be temperature independent for all CB fractions and to be decreased when the CB volume concentrations loaded in copolymer matrix increases. It is found that the activation energy obtained by the modulus method is in good agreement with that obtained by the DC conductivity in the power law which is independent on the CB contents that exist in the copolymer matrix, suggesting that these particles do not interact significantly with the chain segments of the macromolecules in the EBA copolymer.
Highlights
The analysis of complex plane is a well-known and powerful technique which has long been used for investigating dielectric and electrical properties of materials
We have investigated the electrical properties of carbon black (CB) loaded in ethylene butylacrylate copolymer composite (EBA) in the frequency range between 102 and 104 Hz and temperature range between 153 and 353 K
It is found that the activation energy obtained by the modulus method is in good agreement with that obtained by the DC conductivity in the power law which is independent on the CB contents that exist in the copolymer matrix, suggesting that these particles do not interact significantly with the chain segments of the macromolecules in the EBA copolymer
Summary
The analysis of complex plane is a well-known and powerful technique which has long been used for investigating dielectric and electrical properties of materials. We report the results of the analysis of experimental data of spectrum modulus, using the electrical modulus formalism with a Kohlraush Williams Watt (KWW) distribution of relaxation times and the Jonscher’s power law with frequency dependence to extract information about the dielectric relaxation in carbon black particles filled ethylene butylacrylate copolymer composite (EBA) regarding carbon concentrations above the conductivity threshold Φc ≈ 12% [10] This approach is supported by a wide range of technologically important applications which require highly loaded Φ > Φc carbon black polymer composites, like light emitting diodes [11] and electromagnetic shielding [12,13]. Our understanding of the dielectric relaxation mechanisms depends sensitively on the carbon black mesostructure
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