Solid state ionic conductivity of 2-vinylpyridine-acrylonitrile copolymer and its hydroiodide and hydrofluoride salts

Abstract

The synthesis and conductivity study of 2-vinylpyridine-acrylonitrile copolymer and its hydroiodide/ hydrofluoride salts are reported here. The copolymer and the polyelectrolytes are characterized by infrared, proton nuclear magnatic resonance, thermogravimatric analysis, differential scanning calorimetry, X-ray diffraction, and gel permeation chromatography techniques. The alternating current conductivities are measured within the temperature range 30-90°C by varying the frequency from 42 Hz to 5 MHz and found to be significantly higher than that of the copolymer. There observed a 10 5 -and 10 4 -fold increase in ionic conductivities for the salts of HI and HF, respectively. The ionic transport numbers are measured with the help of standard Wagner polarization technique, and the values for HI and HF salts are 0.97 and 0.94, respectively, which are relatively higher than that of the copolymer (0.71). The apparent activation energies for conduction for the copolymer and its salts are also measured.

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