Abstrakt

Synthesis, Characterization and Dielectric Study of Polypyrrole/Zinc Tungstate (Ceramic) Composites

Sangappa K Ganiger, Chaluvaraju B V, Murugendrappa M V

In-situ polymerization of pyrrole (Py) was carried out with Zinc Tungstate (ceramic) in the presence of oxidizing agent ammonium persulphate to synthesize polypyrrole (PPy)/Zinc Tungstate (ZnWO4) by chemical oxidation method. The PPy/ZnWO4 composites were synthesized with various compositions viz., 10, 20, 30, 40 and 50 wt. % of ZnWO4 in Py. The surface morphologies of these composites were analysed using Scanning Electron Microscopy (SEM) show that ZnWO4 particles are embedded in PPy chain to form multiple phases. The Fourier Transform Infra-Red Spectroscopy (FTIR) reveals that stretching frequencies were shifted towards higher frequency side. The powder X-ray diffraction (XRD) spectrograph suggests that they exhibit semi-crystalline behaviour. Thermal analysis (TG/DTA) studies/testing were done and reported. The frequency dependent �?1, �?11 and tangent loss reveals that, concentration of the ZnWO4 in PPy is responsible for the variation in value of �?1 and �?11 of the composites. The dimensions of ZnWO4 particles in the matrix have a greater influence on the �?1 and �?11.