Abstract
New polymer-salt systems have been prepared by doping synthesized poly(N-phenylene N′imino pentyl) imminium propane sulfonate with NaPF6 and NaCl. The higher conductivity of the NaPF6-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.
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Acknowledgments
DST, New Delhi, is acknowledged for financial support to “Development of sodium ion conducting—electrochemical application” (DST Reference No-SR/S2/CMP0065/2007 dated 08/04/2008). The authors are also thankful to Prof. P C Srivastava (Department of Physics, BHU, Varanasi) and Dr. Meenakshi Singh (Department of Chemistry, MMV, BHU, Varanasi) for lab facility and valuable discussions.
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Tiwari, T., Tarannum, N., Kumar, M. et al. Ion transport properties of NaPF6- and NaCl-doped poly(N-phenylene N′imino pentyl)imminium propane sulfonate. Ionics 20, 1435–1443 (2014). https://doi.org/10.1007/s11581-014-1097-0
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DOI: https://doi.org/10.1007/s11581-014-1097-0