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|Title:||Preparation, characterization and conductivity measurement of poly(4-vinyl pyridinium) salts in solid state|
|Authors:||Chetia, Jitu Ranjan|
|Abstract:||The conductivity and the conduction behaviour of poly (4-vinyl pyridine), poly (4-vinyl pyridinium) bromide and poly (4-vinyl pyridinium) iodide have been reported. 4-vinylpyridine (4VP) is polymerized thermally and the salts are prepared by acidification. The formation of P-4VP salts is confirmed by NMR and analytical method. Electrical conductivities are studied by impedance spectroscopic technique in the temperature range 30 to 90°C at various frequencies in solid state. It is observed that addition of ion increases the ionic conductivity of the polymer with respect to frequency and temperature. There is about 10<sup>2</sup> to 10<sup>3</sup> fold increase in conductivity for the new polymer salts. The new materials are shown to be predominantly ionic conductor with <i style="">t</i><sub>ion</sub>≈ 0.935 and 0.825 for bromide and iodide salt respectively. Apparent activation energies are determined from logs versus 1000/T curves and found to be 0.075, 0.049 and 0.123 eV for poly(4-vinyl pyridine), its bromide and iodide salt respectively. The polymer salts behave as good polyelectrolyte.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.11(1) [January 2004]|
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