Dresden 2006 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 24: Poster presentation

DS 24.3: Poster

Dienstag, 28. März 2006, 15:00–17:30, P2

Reorganisation of ultrathin PEO films by water exposure — •Evelyn Meyer and Hans-Georg Braun — Leibniz Institute of Polymer Research, Max-Bergmann Center of Biomaterials, D-01069 Dresden, Hohe Strasse 6

Ultrathin PEO films (thickness < 5 nm) which are prepared by dip-coating can crystallize in highly branched lamella structures which are caused by a diffusion controlled growth process within the thin polymer layer. The water soluble polymer can rearrange on the surface by water exposure. We used a inkjet based microdroplet generator to deposit small (≈ 80 micrometer) sized water droplets on the ultrathin film. Dissolution of the PEO film within the water droplet impact zone results in micropatterned PEO films. The morphological features resulting from the water droplet impact give information about the size of the impact zone on the surface and about the dissolution and reorganisation processes of the PEO molecules. Within the impact zone dewetting layers were observed and dendritic PEO lamellae growing from the rim inside the impact zone are identified and discussed. An experimental setup in which a thin water layer entrapped in a slit between a truncated pyramidal made and an ultrathin PEO layer can be moved with defined velocities across the PEO film will be used to demonstrate the reorganisation processes of (partly) dissolved PEO films both on homogeneous and heterogeneous surfaces.