Characterization of C2H2O4 doped PVA solid polymer electrolyte

Abstract

A novel solid polymer electrolyte based on poly vinyl alcohol (PVA) with oxalic acid was prepared by the solution caste technique. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) measurements carried out on the samples clearly revealed the modification of the PVA structure; the PVA crystallinity was reduced with increasing oxalic acid content and became more amorphous. The surface morphology of these complexed polymer electrolytes was analyzed by scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) spectral studies of the samples suggested that the interaction between H + ions of oxalic acid and oxygen of the hydroxyl group (OH) of PVA plays a major role in proton conductivity. The optical absorption studies were performed on these samples in a range of wave numbers from 200 nm to 600 nm and the optical band gap values were evaluated. Direct current (DC) conductivity was measured and temperature dependence in the range 27-273°C was studied. It was observed that the conductivity at temperatures beyond the glass transition temperature (T g ) showed a Vogel-Tamman-Fulcher (VTF) type behavior. The electrical conductivity studies on PVA with oxalic acid, in a 70:30 proportion by wt%, demonstrated that the polymer composite is a promising electrolyte for applications in electrochemical cells.

Hydrolyzed collagen on PVA‐based electrospun membranes: Synthesis and characterization

“…Figure 6 also shows the formation of endothermic peaks at 224°C, a value similar to that reported by Ding, et al (2010), which corresponds to the PVA melting point ( T m ), 95 and another detectable peak around the 270–280°C, attributed to its decomposition temperature 96 . This behavior was observed in all cases, and there were no significant differences ( p > 0.05) among samples.…”

Fabrication and Characterization of High-Performance Crosslinked PVA/ PMDA Doped with H2SO4

“…The sample with 20wt.% PMDA showed low dielectric constant values. This can be understood in terms of the degree of crosslinking and changes in crystallinity [18,19].…”