Synergistic effect of polymer blend compositions on the structural, thermal, optical, and broadband dielectric properties of P(VDF-HFP)/PEO/ZnO polymer nanocomposites
Chandra Prabha Charan, R.J. Sengwa, Mukul Saraswat
Abstract
Polymer nanocomposites (PNCs) composed of poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP))/ poly(ethylene oxide) (PEO) blend host matrix of varying compositions xP(VDF-HFP)/(100–x)PEO-2 wt% ZnO films with x values 20, 50, and 80 wt%, and zinc oxide (ZnO) as nanofiller (2 wt%) are prepared by state-of-the-art homogenized solution cast method. The SEM micro-images of these PNC films revealed that the polymer blend compositions considerably affect the polymers miscibility, spherulitic morphologies, and crystalline phases. FTIR spectra demonstrated that the P(VDF-HFP) and PEO chain interactions in these PNCs change significantly with the polymer blend composition. The DSC results revealed a decrease in PEO crystallite temperature and degree of crystallinity with the increase of P(VDF-HFP) amount in the blend matrix of these PNC materials. Analysis of UV-Vis spectra categorized these PNCs of wide band gap (∼ 3.1 eV) semiconductive optical materials. Broadband frequency range (20 Hz – 1 GHz) dielectric dispersion demonstrated that 50P(VDF-HFP)/50PEO-2 wt% ZnO composition based nanodielectric film has a relatively high dielectric constant, whereas the chain segmental and dipolar reorientation relaxation processes are strongly blend composition dependent for these PNC materials. The experimental results are considered and discussed in detail concerning the multifunctionality of these PNCs as promising candidates for innovation in flexible optoelectronic and nanodielectric-based microelectronic devices.