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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 Schönhoff11Institut 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 1010 Scm1 to 107 Scm1 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.

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