Regensburg 2007 – wissenschaftliches Programm

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SYPE: Symposium Polyelectrolytes

SYPE 1: Polyelectrolytes Poster

SYPE 1.4: Poster

Mittwoch, 28. März 2007, 16:00–18:30, Poster B

Conductivity spectra of polyphosphazene based polyelectrolyte multilayers — •Yahya Akgöl¹, Christian Hofmann¹, Yunus Karatas², Cornelia Cramer¹, Hans-Dieter Wiemhöfer², and Monika Schönhoff¹ — ¹Institut für Physikalische Chemie und SFB 458, WWU Münster, Germany — ²Institut für Anorgansiche und Analytische Chemie und SFB 458, WWU Münster, Germany

Polyphosphazenes are promising materials for application as polymer electrolytes with a high ion conductivity die to their flexible backbone. Here, polyelectrolyte multilayers are built up from ionically modified polyphosphazenes by layer-by-layer assembly of a cationic and an anionic polyphosphazene (PAZ+ and PAZ-). In comparison, multilayers of poly (sodium 4-styrenesulfonate) (PSS) and poly(allylamine hydrochloride) (PAH) are investigated. Frequency-dependent conductivity spectra are taken in sandwich geometry at controlled relative humidity. Conductivity spectra of ion conducting materials generally display a dc plateau at low frequencies and a dispersive regime at higher frequencies. Dc conductivity values, which can be attributed to long range ionic transport, are on the order of 10₋10 Scm₋1 to 10₋7 Scm₋1 and strongly depend on relative humidity. For PAZ+/PAZ- multilayers the dc conductivity is consistently larger by one decade as compared to PSS/PAH layers. The dispersive regime shows a frequency-dependence, which is deviating from the typical behaviour found in most ion conducting materials.