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In this article, a neem gum-based polymer electrolyte is synthesised using the solution casting approach. XRD, FTIR, and AC impedance analysis are used to investigate the structural and electrical properties of bio-gel polymer electrolytes (BGPEs) that have been synthesized. According to XRD analysis, the film is more amorphous at 60 wt % PVA: 20 wt % NG: 20 wt % NaCF 3 SO 3  (BP2). The observed amorphous nature is due to a greater number of Na +  and CF 3 SF 3 – ions coordinated with the polymer side chains’ COO –  and OH –  groups. The FTIR analysis revealed the disappearance of CH2 wagging of pure Poly (vinyl alcohol) (PVA) and shifting of stretching vibration mode of (C – N) aromatic functional group of protein of pure neem gum (NG) due to complexation of blended polymer (PVA: NG) with Na ions. The conductivity of the produced films is analysed using the conductance spectra, and the film BP2 (60 wt % PVA: 20 wt % NG: 20 wt % NaCF 3 SO 3 ) is found to have the highest ionic conductivity (≈ 5.328 x 10-4 Scm-1) at 303 K. Flexibility, hopping mechanism are well enhanced in host polymer (PVA: NG) due to the addition of ionic salt NaCF3SO3, which is clearly observed in the dielectric spectra.

An investigation on conductivity and dielectric behaviour of neem gum blended PVA biopolymer electrolytes