Conductive composites of polyaniline and polypyrrole with MoO3

Composites of polyaniline and polypyrrole with MoO3 were prepared via polymerization of the respective monomer by ammonium vanadate (AV)/H2SO4 oxidant system in presence of an aqueous suspension of MoO3. Formation of PANI and PPY and their subsequent incorporation in the PANI-MOO3 and PPY-MoO3 composite systems was endorsed by FTIR spectral analyses. Thermogravimetric analyses (TGA) revealed the overall thermal stability upto 1000 degrees C as follows: MoO3 > PANI-MoO3 > PANI and MoO3 > PPY-MoO3 > PPY. Differential thermal analyses (DTA) of PANI-MoO3 and PPY-MoO3 composites indicated occurrence of oxidative degradation characteristic of the corresponding homopolymers. XRD scans of PANI-MoO3 and PPY-MoO3 composites suggested that crystalline structure of MoO3 remained undisturbed upon incorporation of PANI or PPY moieties in the MoO3 matrix. Dc conductivity values of PANI-MoO3 and PPY-MoO3 composites were in the order of 10(-2) and 10(-3) S/cm, respectively. (c) 2005 Elsevier B.V All rights reserved.