ELECTRICALLY CONDUCTING POLYANILINE AND POLYANILINE POLYCARBONATE COMPOSITE FILMS - PREPARATION, CHARACTERIZATION AND ELECTRICAL-CONDUCTIVITY MEASUREMENTS/

Polyaniline (PAN) films and composites of polyaniline with poly bisphe nol A carbonate (PC) have been prepared electrochemically. The electri cal conductivity measured from room temperature down to 77 K is larger in air than in vacuum and obeys a 1D variable range hopping (VRH) mec hanism. From DTA analysis of the composite him, an extra peak at 210 d egrees C apart from the usual peaks of PC and PAN has been identified. It is believed to be the result of a chemical interaction between PAN and PC, that is further confirmed from the shift in the carbonyl peak in the FTIR spectra of the composite films. From XPS studies and elec trical conductivity measurements of different films it seems that it i s the proportion of ionic chlorine rather than covalent chlorine to ni trogen that is more important in determining the conductivity. SEM pic tures clearly indicate the formation of a fibrilar network in the comp osite film, especially inside the craters seen on the surface.