Production and modification of PEO/PVDF Membranes Loaded with Silver Nitrate

ABSTRACT Porous membranes of PEO/PVDF loaded with different concentrations of PEO and 10 wt.% of AgNO 3 nanoparticles were prepared. Structural, morphological and thermal properties of these membranes were studied. Most PVDF phases and compatibility with micropores were observed. Complexation between PVDF and PEO was significantly decreased with increasing of PEO content. FT-IR analysis revealed that some bands were disappeared with increasing of -phase of PVDF, this phase can be useful in electrical applications due to its polarizability since PVDF is piezoelectric polymer. UV-vis shows an exponential decay tail at low energy which indicates the presence of localized states in energy band gap. In SEM picture sponge-like pores are present structures. The porous size was distributed in range from 0.10 to 0.65 mm. Increasing of PEO can decreased pore size of the membranes The values of both degree of crystallinity and melting temperature were decreased as the content of PEO increased which is attributed to homogeneity and miscibility between membranes composites

Physical properties of MnCl2 fillers incorporated into a PVDF/PVC blend and their complexes

Films of a PVDF/PVC blend filled with different concentrations of MnCl2 were prepared by using a casting technique. The prepared films were investigated by different methods. X-ray diffraction scans revealed the amorphous nature of the blend for low concentrations and a crystalline nature for higher ones. Results obtained by FTIR led to conclusions about the specific interactions in the polymer matrices and hence about the complexation. The morphological structure of the prepared samples was studied by SEM, which confirmed the results of XRD and DC electrical conductivity measurements. The ESR spectra of the samples exhibited resonance signals only after the introduction of Mn2þ ions into the blend. The DC conductivity was measured in the temperature range of 300–435 K in order to analyze the mechanism of the conduction. The conductivity–temperature plots were found to follow an Arrhenius relationship

Electrical investigation and enhancement of optical, structural, and dielectric properties of flexible PVDF/LiZnVO4 nanocomposites

Abstract Thin polymeric films of poly(vinylidene fluoride) (PVDF) containing variable mass fractions of nanoparticles (LiZnVO4) were successfully synthesized via the ordinary solution casting method. X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and ultraviolet–visible spectroscopy were used to explore the role of LiZnVO4 on the structural and optical characteristics of synthesized nanocomposites. In addition, dielectric permittivity (ε' and ε") and dielectric modulus (M' and M") were investigated. The XRD spectral data reveals the crystalline nature of pure LiZnVO4 with rhombohedral structure with an average size of 83 nm calculated using the Scherer'sa equation and W-L plot. The interaction between PVDF and LiZnVO4 was approved through the shift in characteristics in some IR bands. The decrease in band gap energies with increasing LiZnVO4 was attributed to the change of density in the localized states within the PVDF matrix. The effect of both frequency and temperature on the AC parameters was also investigated. Both ε' and ε" had their maximum values at low frequencies and decreased as the frequency and temperature increased. The results from XRD and FT-IR were correlated with changes in the dielectric characteristics at the maximum level value of LiZnVO4, suggesting the potential of these materials as basic components for lithium-ion batteries