Optical and dielectric properties of poly(vinylacetate)/lead oxide composites

Composite films of poly(vinylacetate)/red lead oxide have been prepared by mixing the fine lead oxide particles into polyvinylacetate solution under ultrasonication followed by film casting technique. Structural, optical and dielectric properties have been performed to characterize these composites films and compared their properties to pure PVAc film. The changes in the structural of the prepared films were investigated by X-ray diffraction (XRD) and FT-IR spectra. It has been observed that the crystallinity of the composites films depends on the Pb-content. Optical spectra of the composites films showed direct allowed band gaps lying in the range of 5.0-4.6 eV which is lower than that of PVAc. Frequency and doping level dependence of dielectric constant (epsilon'), ac conductivity (sigma(ac)) and tangent loss (tan delta) have been measured. The values of epsilon' were decreased with increasing in frequency, which indicates that the major contribution to the polarization comes from orientation polarization. The ac conductivity is more for doped PVAc than that of undoped PVAc. The experimental results show that epsilon' and sigma(ac) increase with adding of lead oxide in PVAc. The controllable of optical and dielectric properties of the composite film will draw much attention for potential applications.