Copolymer samples were prepared by joint oxidation of aniline and 1,4-phenyl-enediamine with the possibility of controlling electrical properties by the changing of aniline content in the reaction mixture. Temperature dependence of DC conductivity, frequency dependence of AC conductivity and electric modulus were studied, with the aim to determine mechanisms of charge transport in the material. Due to low molecular weight, polyaniline and phenylenediamine units form amorphous material, similar to typical amorphous semiconductor, where doping leads to creation of electronic states which are localized in sites of dopant counterions. Charge transport takes place via variable range hopping (VRH) in 3 dimensions. The high disorder and broad distribution of relaxation times was found in these materials.