Effect of ethylene carbonate plasticizer on agar-agar: NH4Br-based solid polymer electrolytes

Abstract

Proton-conducting polymer electrolytes based on biopolymer, agar-agar as the polymer host, ammonium bromide (NH4Br) as the salt and ethylene carbonate (EC) as the plasticizer have been prepared by solution casting technique with dimethylformamide as solvent. Addition of NH4Br and EC with the biopolymer resulted in an increase in the ionic conductivity of polymer electrolyte. EC was added to increase the degree of salt dissociation and also ionic mobility. The highest ionic conductivity achieved at room temperature was for 50 wt% agar/50 wt% NH4Br/0.3% EC with the conductivity 3.73 × 10−4 S cm−1. The conductivity of the polymer electrolyte increases with the increase in amount of plasticizer. The frequency-dependent conductivity, dielectric permittivity (ε′) and modulus (M′) studies were carried out.

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Correspondence to T. Mathavan or S. Selvasekarapandian.

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Selvalakshmi, S., Mathavan, T., Selvasekarapandian, S. et al. Effect of ethylene carbonate plasticizer on agar-agar: NH4Br-based solid polymer electrolytes. Ionics 24, 2209–2217 (2018). https://doi.org/10.1007/s11581-017-2417-y

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Keywords

  • Biopolymer
  • Plasticizer
  • AC impedance spectroscopy