Dresden 2003 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 22: POSTER C
CPP 22.58: Poster
Donnerstag, 27. März 2003, 12:00–14:00, ZEU/250
Dynamics and Flow in a Dewetting Block-Copolymer Melt — •Daniel Podzimek1, Karin Jacobs1, and Robert Magerle2 — 1Experimental Physics, Saarland University, Saarbrücken — 2Dep. of Physical Chemistry II, University of Bayreuth
We are investigating the flow properties of a confined, structured liquid. For the experiments, we study the dewetting of thin block-copolymer films from a solid substrate. The block-copolymer consists of two incompatible blocks that form microdomains upon annealing. If shear is applied, the melt will react with an alignment of the respective domains. Longer annealing above the glass transition temperature leads to a dewetting of the film by hole formation. Since the three phase contact line is moved by internal dewetting forces, shear is applied without external tools. The effect of shear on microdomain ordering is monitored on the rim, in the vicinity of the hole. Depending on local film thickness and local dewetting velocities, different patterns can be observed in situ by atomic force microscopy in tapping modeTM. Additionally, nanotomography (R. Magerle, PRL 85 (2000) 2749) is applied to investigate the domains in the rim volume in three dimensions.