Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 29: POSTER: Polymer physics

CPP 29.7: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Internal Order in Polyelectrolyte Multilayers — •Manesh Gopinadhan¹, Jens-Uwe Günther¹, Heiko Ahrens¹, Roland Steitz², and Christiane A. Helm¹ — ¹Angewandte Physik, Universität Greifswald, 17487 Greifswald — ²Hahn-Meitner Instiut Berlin, 14109 Berlin

Polyelectrolyte multilayer fabrication by consecutive adsorption of polyanions and polycations proved to be a versatile method for a broad range of applications. Multilayers were prepared by consecutively adsorbing poly(allylamine) hydrochloride (PAH) and polystyrene sulfonate (PSS) from aqueous KCl solution (1 Mol/L) at different temperatures, approaching the precipitation temperature at 55^∘C. Thus, the film thickness can be increased by up to 70%. With neutron reflectivity measurements on multilayers with every second PSS layer deuterated, the layer interdigitation is probed. Up to 35^∘C, the film/air roughness as determined by X-ray reflectivity and the internal roughness per bilayer thickness determined by neutron reflectivity increase linearly with the layer thickness. On further increase of the preparation temperature, the internal roughness increases more than the polyelectrolyte bilayer thickness, proving large interdigitation caused by local polyelectrolyte coils.