Abstract
In this study conductive composite of ethylene vinyl acetate (EVA)/polyaniline (Pani) were prepared by in-situ polymerization technique. Dielectric properties (Permittivity) of the composites have been investigated with respect to concentration of Pani and frequency of electric field. For predicting permittivity of the composites, different mixing rules proposed by Lichtenecker, Bruggeman, Jaysundere-Smith, Maxwell-Wagner, and Yamada have been verified at 10, 10(3), and 10(6) Hz frequencies. It has been found that the theoretical permittivities predicted by different models differ largely from experimental permittivity when measured at 10 and 10(3) Hz frequencies. The limitations of the models as well as the cause of deviations between the theoretically predicted and experimentally observed results have been discussed. A new model for permittivity has been proposed by considering the generation of interface polarization between the EVA matrix and Pani particles. This model fits well with the experimentally observed results. (C) 2012 Elsevier Ltd. All rights reserved.