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DSC, Electrical Conductivity, and NMR Studies of Salt Precipitation in PPO Complexes.
HUNTER COLL NEW YORK DEPT OF PHYSICS AND ASTRONOMY
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DSC and electrical conductivity measurements of PPQ complexed with Sodium Iodide and Potassium Thiocyanine are reported. In addition, 23 NMR measurements of PPO8NaI, both at ambient and elevated pressure 2.0 kbar have been performed. The DSC data clearly indicate that the salt precipitates out of the complexes at about 85 for NaI and 60C for KSCN. These effects are manifested by a dramatic departure of the conductivity form VTF behavior, and a relatively sharp drop in mobile Na concentration deduced from NMR measurements at somewhat elevated temperature about 80C. High pressure NMR linewidth measurements are consistent with a pressure-induced increase in the glass transition temperature.
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