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Comparative studies on plasticized and unplasticized PVA polymer electrolytes containing NaF salt

Solid Polymer electrolyte films based on Poly (vinyl alcohol) (PVA) containing Sodium fluoride (NaF) and PEG (Polyethylene Glycol) as plasticizer are prepared by solution casting method and characterized by XRD and FTIR techniques. The X-ray diffraction (XRD) spectra shows a characteristic peak of PVA indicating its semi-crystalline nature. By the addition of NaF, PEG and NaF into the polymer blend matrix, the intensity of peak decreases gradually, suggesting a decrease in the degree of crystallinity of the samples. FTIR study confirmed the complexation and functional group occurred by the addition of NaF and plasticizer PEG in the polymer blend. Dielectric and a.c. conductivity studies were carried out to the as prepared films at room temperature. Dielectric Constant (e′) is maximum and found to decrease with increase in frequency and electrical conductivity of the complexed polymer blends increases by the addition of NaF with PEG. Literature reveals that these films found applications in energy storage devices.