Effect of polyvinyl alcohol on structural and dielectrical properties of polyaniline

a Department of Physics, G. C. University Faisalabad. Layyah Campus, Layyah (31200), Pakistan b Department of Physics, AIOU, Islamabad (44000), Pakistan c Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan d Department of Physics, Govt. Post Graduate college Jampur, Pakistan In this paper, we have synthesized polyaniline (PAni) composite with poly vinyl alcohol (PVA) having various ratio of PVA by chemical polymerization method. For structural investigation, the prepared composites have been characterized by using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and thermo gravimetric (TG) analysis. The XRD pattern reflects the amorphous nature of all composites. Strong structural bands formation has been observed in FTIR spectra and also the inter-linking of PAni and PVA in these composites. The SEM pictures exhibit that composites are having grain size ranging from 40-90 nm. TG analysis shows that (PAni-PVA) composites are thermally stable up to 180 o C. Moreover, dielectric properties of composites have been measured by LCR meter in the frequency range of 1Hz to 3GHz. The dielectric constant (ε) has an inverse relation with the frequency. Interestingly, the ac conductivity displays plateau like behavior in low frequency region and shows dielectric dispersion in high frequency range for all composites.