Dresden 2009 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 35: Poster Session II
MM 35.40: Poster
Wednesday, March 25, 2009, 16:30–18:30, P4
Salt Precipitation in Complexes of Polyethylene Oxide and Alkali Metal Iodides — •Manuel Reschke, Jens Bastek, Nicolaas Stolwijk, and Gerhard Wilde — Universität Münster, Institut für Materialphysik, 48149 Münster
Thermodynamic properties of polymer electrolytes have been the subject of many scientific reports. DSC measurements were performed on PEO20RbI over the temperature range from 0∘C to 170∘C for different heating rates. The calorimetric curves show an endothermic peak at about 110∘C which can be assigned to the precipitation process of the RbI salt out of the polymer matrix. With lower heating rates, the endothermic peak monotonically shifts to a lower temperature. By extrapolation to zero heating rate, the critical precipitation temperature TC was determined. These TC values can be compared with earlier data from conductivity measurements and NMR analyses [1]. Salt precipitation in PEO30CsI was observed by X-ray diffraction after quenching of the complex from Temperatures larger than TC. Current experiments should provide information about the size of the RbI precipitates by detailed analysis of the diffraction peaks.
[1] J. Bastek, Th. Köster, L. van Wüllen, N.A. Stolwijk, Electrochem. Acta. submitted