Blends of polyaniline (PANI) doped with camphor sulfonic acid and ultra high molecular weight polyethylene were prepared using a mixture of m-cresol and decaline under conditions that promote specific interactions between the polymer, dopant and solvent mixture, leading to films with improved electrical conductivity. Such interactions are in agreement with the formation of supramolecular structures based on hydrogen bonding and phenyl stacking reported in the literature for similar systems. The results from the blend characterization by tensile strength and electrical conductivity measurements, differential scanning calorimetry, UV-Vis spectroscopy, X-ray diffraction and scanning electron microscopy are presented and discussed. Low percolation threshold and high conductivity were obtained, for instance, 10(-6) and 10(-2) S/cm, for blends containing 1 and 5% of PANI, respectively. (C) 2000 Elsevier Science Ltd. All rights reserved.