Abstract: The natural abundantly available non-toxic, bio-compatible and bio-degradable biopolymers and polysaccharides had become more viable in the synthesis of polymer electrolytes. They became a prime interest in the development of energy storage devices like batteries, fuel cells, sensors and super-capacitors due to their eco-friendliness and cost-effectiveness over the other synthetic available SPE (solid polymer electrolytes). Tamarind seed polysaccharide a biopolymer extracted from tamarind seed has applications in the food industry, cosmetics, pharmaceutical industry and dyeing industries due to it's stabilizing, thickening and gelling nature and it is an emulsifying agent. The biopolymer electrolytes were prepared by polysaccharide TSP (tamarind seed polysaccharide) as a host polymer with various proportions of Sodium Bromide (NaBr). The solvent casting technique was used to synthesize the biopolymer membranes with distilled water as solvent. The obtained biopolymer electrolytes were investigated with XRD, FTIR, AC impedance spectroscopy, UVoptical spectroscopy and transference number measurements (TNM). The obtained biopolymer electrolytes films were subjected to XRD analysis of the study of the amorphous/crystalline nature. The complex formation between host polymer TSP and ionic salt NaBr is confirmed by the FTIR spectrum. The magnitude of ionic conductivity is found to be increased with an increase in salt ratios and temperature. The dielectric parameters like dielectric constant, dielectric loss and tangent loss were studied from AC impedance spectroscopy in the frequency range of 42 Hz to 1MHz. The AC impedance data analysis revealed that the biopolymer membrane of 1g TSP:0.4g NaBr has the maximum ionic conductivity of 5.2x10-6Scm-1 at room temperature. The decrease in activation energy Ea with the increase in compositions confirmed the Arrhenius relation of the polymer membranes. From the transport number calculations, the transference number close to unity revealed that the conductivity is due to the ions as the predominant charge carriers. The optical band gaps were calculated from the obtained absorption spectra in the range of 200-800 nm.

Preparation and characteristic investigations of tamarind seed polysaccharide-based bio-polymer electrolyte with sodium bromide

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.