Complex impedance and multifrequency 23Na NMR study of poly (propylene oxide) complexed with NaB (C6H5)4

Y. S. Pak, K. J. Adamic, S. G. Greenbaum, M. C. Wintersgill, J. J. Fontanella, C. S. Coughlin

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Complex impedance and multifrequency 23Na nuclear magnetic resnoance (NMR) measurements on a poly (propylene oxide): sodium tetraphenylborate, PPO8NaB(C6H5)4, solid polymer electrolyte, with a composition of eight ether oxygens per sodium, are reported. The NMR linewidths are found to be second-order quadrupole broadened, thus indicating low site-symmetry for the Na+ ions. The title compound exhibits some interesting differences in properties compared to other PPO-Na salt complexes, including an anomalously low value of the stretched exponential parameter ßse (obtained in fits to electric modulus data), an unusually high glass transition temperature (Tg=306 K), and sub-Tg line narrowing of lower frequency 23Na resonances. This last phenomenon is attributed to strong interaction between the Na+ ions and their large [B(C6H5)4]- counterions caused by the localization of the [B(C6H5)4]- anions in weak interactions with the polymer chains which, in turn, leads to the elevated glass transition temperatures.

Original languageEnglish (US)
Pages (from-to)277-284
Number of pages8
JournalSolid State Ionics
Issue number3-4
StatePublished - Apr 1991

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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