Variable-temperature four-probe conductivity measurements and Raman sp
ectroscopy were investigated for iodine in poly(propylene oxide) (PPO)
and NaI3 in PPO. The Raman spectra indicate the presence of both trii
odide and polyiodide species in samples Of I2-doped PPO. The conductiv
ity of these PPO/I2 Samples increased with increasing I2 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
3-, the dominant species is the triiodide. Polymer salt complexes with
varying amounts Of I3- appear to display a conductivity threshold nea
r T(g), at 0. 2 vol fraction of triiodide.