Abstract
In this work, nanocomposite polymer films based polyvinyl alcohol with different weight ratios of nanoparticles TiO2 were prepared by the casting method. Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR) and dielectric spectroscopy of all compositions have been investigated. The SEM analysis showed that TiO2 nanoparticles were well dispersed in the PVA matrix. However, below 30 wt% aggregates were observed. Differential Scanning Calorimetry evaluated the degree of crystallinity and transition temperature. Infrared spectroscopy evidenced the presence of interactions between the PVA and TiO2. Impedance spectroscopy measurements of all samples were studied as functions of temperature and frequency. Dielectric permittivity and loss tangent reveal seven relaxation processes ascribed to electrode polarization, conduction phenomena, Grain–Boundary–Relaxation, MWS relaxation, and (αa, αc and β) relaxations. The activation energy values Ea associated with DC conductivity confirm the protonic type of the conductivity and present a lower value for the PVA with 5% amount of TiO2. In addition, the temperature dependence of the exponent power s denoted that conduction in the sample bulk follows the CBH model.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
