Tailoring dielectric performance of yttrium oxide and strontium titanate incorporated poly(vinylidene fluoride-co-hexafluoropropylene)-/poly(methyl methacrylate) blend nanocomposites for electrostatic capacitor applications.

This study focuses on the fabrication of flexible nanocomposite films composed of polymethyl methacrylate (PMMA), polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP), yttrium oxide (Y2O3) and strontium titanate (SrTiO3) using a solution casting method. The chemical structure and functional groups available in the developed films were analyzed through Fourier Transform Infrared Spectroscopy (FTIR). Structural alterations prompted by the alliance of Y2O3 and SrTiO3 into the PVDF-HFP/PMMA matrix were investigated using X-ray Diffraction (XRD), which indicated notable modifications in the nanocomposite structure. The dispersion of fillers and surface morphology within the polymer blend were further examined using Field Emission Scanning Electron Microscopy (FESEM). Thermal aspects of the nanocomposite films were assessed by Thermogravimetric Analysis (TGA), revealing improved resistance to thermal degradation with the addition of nanofillers. Dielectric properties were studied to assess variations in dielectric constant (ε') and dissipation factor (tan δ) across diverse frequencies and temperatures. The outcomes revealed that the inclusion of both nanofillers boosted the dielectric constant, primarily due to interfacial polarization effects within the composite system. Additionally, both ε' and tan δ increased as frequency decreased for all samples. Overall, the findings confirm successful preparation of well-dispersed nanocomposites with promising potential for energy storage applications.