Abstract
Variable-temperature four-probe conductivity measurements and Raman spectroscopy were investigated for iodine in poly(propylene oxide) (PPO) and NaI[sub 3] in PPO. The Raman spectra indicate the presence of both triiodide and polyiodide species in samples of I[sub 2]-doped PPO. The conductivity of these PPO/I[sub 2] samples increased with increasing I[sub 2] concentration and reached a plateau at approximately 12 vol % iodine. Raman spectra at 20 [degrees]C indicate that, at concentrations less than 23 vol% I[sup [minus][sub 3]], the dominant species is the triiodide. Polymer salt complexes with varying amounts of I[sup [minus][sub 3]] appear to display a conductivity threshold near T[sub g], at 0.2 vol fraction of triiodide. 6 figs., 1 tab.
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