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CPP: Chemische Physik und Polymerphysik

CPP 10: POSTER Nonequilibrium Phenomena in Soft Condensed Matter

CPP 10.6: Poster

Dienstag, 28. März 2006, 17:00–19:00, P3

Structure formation in thin block-copolymer films — •Ludovic Marquant, Hendrik Hähl, Daniel Podzimek, Renate Fetzer, Martin Meier, and Karin Jacobs — FR 7.2 Experimentalphysik - Weiche Materie, Universität des Saarlandes, D-66123 Saarbrücken

We are investigating rearrangement phenomena within structured liquids. Our system consists of a thin block-copolymer film of polystyrene-block-polyethylen/propylen (PS/EP) deposited on a non-wetting substrate. Due to a preannealing procedure the microdomains of the polymer melt equilibrate and form an ordered layered structure. Upon shear stress which is induced by the dewetting of the film this stucture undergoes a rearrangement in the vicinity of the three-phase-contactline (air-substrate-film) and forms PS cylinders parallel to the edge of the film, embedded in a PEP-matrix. By tapping mode scanning probe microscopy we investigate this phenomenon at the solid/liquid interface. Here, the alignment of these cylinders gives evidence to a nonzero velocity at the interface, indicating slippage.