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<p><i>Gellan</i> gum (GG) is a linear, negatively charged exopolysaccharide with a backbone composed of four repeating carbohydrate units. This biopolymer exhibits several beneficial properties, including biocompatibility, non-toxicity, and a three-fold coaxial double-helix structure. A series of GG-based biopolymer electrolytes incorporating sodium methyl sulfate (SMS) and glycerol (Gly), referred to as GG-SMS-Gly, were synthesized using the solution casting method. The prepared samples were characterized through Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and impedance spectroscopy (EIS). Vibrational spectroscopy results confirm interactions between the functional groups of GG such as O–H, C = O, and C–O–C, and the added salt and glycerol via hydrogen bonding. XRD analysis indicates a decrease in the degree of crystallinity with increasing salt/glycerol concentration, reaching a minimum for GG-SMS-Gly-50, which exhibited an ionic conductivity of approximately 3.94 × 10⁻<sup>4</sup> S/cm at 30&#xa0;°C. TGA analysis reveals that the samples primarily decompose in two stages, with the addition of glycerol lowering the onset decomposition temperature. The residual weight loss at 700&#xa0;°C ranges from 17 to 29% across all samples. For the optimized sample (GG-SMS-Gly-50), the ionic transference number and electrochemical stability window are measured.</p>

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Plasticized biopolymer electrolyte membranes based on gellan gum-MeSO4Na: structural, thermal and electrical transport properties study

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • Gulshan Kumar Meena,
  • Pooja Rawat,
  • Raghubir Kumar Prajapati,
  • A. L. Saroj

摘要

Gellan gum (GG) is a linear, negatively charged exopolysaccharide with a backbone composed of four repeating carbohydrate units. This biopolymer exhibits several beneficial properties, including biocompatibility, non-toxicity, and a three-fold coaxial double-helix structure. A series of GG-based biopolymer electrolytes incorporating sodium methyl sulfate (SMS) and glycerol (Gly), referred to as GG-SMS-Gly, were synthesized using the solution casting method. The prepared samples were characterized through Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and impedance spectroscopy (EIS). Vibrational spectroscopy results confirm interactions between the functional groups of GG such as O–H, C = O, and C–O–C, and the added salt and glycerol via hydrogen bonding. XRD analysis indicates a decrease in the degree of crystallinity with increasing salt/glycerol concentration, reaching a minimum for GG-SMS-Gly-50, which exhibited an ionic conductivity of approximately 3.94 × 10⁻4 S/cm at 30 °C. TGA analysis reveals that the samples primarily decompose in two stages, with the addition of glycerol lowering the onset decomposition temperature. The residual weight loss at 700 °C ranges from 17 to 29% across all samples. For the optimized sample (GG-SMS-Gly-50), the ionic transference number and electrochemical stability window are measured.