Dielectric properties of polyaniline composites

This study presents a comparison of the dielectric properties of composite materials consisting of insulating polymers (polyamides 6 and 12) containing polyaniline as a conductive phase. Samples were obtained by in situ polymerization of the aniline monomer in the presence of the insulating matrices. The results obtained by dielectric relaxation spectroscopy showed that it was possible to increase the permittivity of the samples by increasing the polyaniline content. Polyamide12-based films exhibit high dielectric permittivities above the percolation threshold. Polyaniline also induces relaxation phenomena, clearly visible at low temperature. It was also shown that the dielectric relaxation phenomena are thermally activated. Some relaxations seem to be of the same nature in polyamides 6 and 12 films because they require nearly the same activation energy.