Studies on Transport Properties of Polyaniline-Ferric Oxide Polymer Composites

The polyaniline-ferric oxide (fe2o3) composites have been prepared for differentweight percentage such as 5%, 10%, 15% and 20% of fe2o3. the polymerization was carriedout by in-situ chemical oxidation technique with ammonium persulphate (aps) as anoxidizing agent in aqueous sulphuric acid as dopent under constant stirring at 0-4 oc. thecharacterization of polymer composites has been carried out by ft-ir, uv-vis so as toconform polymerization, xrd for elucidating the structure of composites. the morphologyof composites was studied by sem. temperature dependent d.c. electrical conductivitymeasurement has been carried by four probe technique in the range of 303-373 k. it has beenobserved that conductivity of all composites is found to be increasing by increasingtemperature. the composites of 5%(pf-1) and 10%(pf-2) has been found to be more whilecomposites 15%(pf-3) and 20%(pf-4) has found to be lower than that of pure pani overentire temperature range. the enhancement in conductivity of pf-1 and pf-2 composites maybe due to uncoiling of polymeric chain due to strong interaction of pani with fe2o3crystallites as suggested by ft-ir and xrd studies. lowering in conductivity of pf-3 andpf-4 may be due to increasing the content in composition which gradually weakenedinteraction between pani and fe2o3; leads to free pani chain coexist in the composites andmay be due to the particle blockage in conductive path by additive embedded in panimatrix.