Ion transport properties of NaPF- and NaCl-doped poly( N-phenylene N′imino pentyl)imminium propane sulfonate.

New polymer-salt systems have been prepared by doping synthesized poly( N-phenylene N′imino pentyl) imminium propane sulfonate with NaPF and NaCl. The higher conductivity of the NaPF-doped system in comparison to the NaCl-containing sample indicated that a larger-sized anion is facilitating ion conduction. FTIR spectra confirmed the complexation of salt with polymer. The conductivity power law exponent, studied in the frequency range from 42 Hz to 5 MHz, varies with frequency and has values >1, demonstrating dominance of caged ion movement. The dominance of caged motion is more pronounced in the NaCl-doped sample, signifying that a smaller anion has greater chances of being caged. Anion size signature is also visible in temperature and humidity dependence of exponent n. [ABSTRACT FROM AUTHOR]