Investigations on pyridinium salts as a solid-state ionics

The object of this work is to prepare polymer poly(2vinylpyridine), P-2VP, and its salts like P-2VP-HI, P-2VP-HIO₃, and P-2VP-HIO₄. The formation of P-2VP salts was confirmed by IR and ¹H NMR techniques. Conductivities of these were determined in solid state at various temperatures from 30 to 90°C. Observations indicated that the addition of I⁻ or IO₃ ⁻ or IO₄ ⁻ ions affect the ionic conductivity of P-2VP. Molecular mass determination and analytical results indicated that 94, 92.5, and 95% of the pyridine molecules in the P-2VP chain were hydroiodated, iodated, and periodated, respectively, with the corresponding acids of iodine. The total ionic transport number and activation energy of the polymers were also determined.