Ion and polymer chain motion in a superionic sodium-poly (ethylene oxide) complex

Magnetic resonance measurements have been performed on the ion conducting complex poly(ethylene oxide)_4.5NaClO. Low temperature²³Na NMR spectra suggest a highly symmetric environment for the Na-ions as evidenced by the absence of quadrupole broadening. Proton spin-lattice relaxation measurements provide an estimate of ~4×10^?10 sec for the polymer chain motional correlation time at T = 69C. Correlation times of tumbling paramagnetic probe molecule have been extracted from EPR spectra of¹⁵N-enriched TANOL-doped complex. Changes in polymer chain mobility above T = 120C are inferred from the results and may be consistent with previous scanning calorimetry measurements.