Regensburg 2004 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 15: POSTER: Polymers and Biomaterials

CPP 15.38: Poster

Tuesday, March 9, 2004, 17:00–19:00, B

Microdomain Ordering and Slippage of a Structured Liquid — •Daniel Podzimek and Karin Jacobs — Saarland University, FR 7.2 Experimental Physics, D-66123 Saarbrücken

In this contribution we present flow properties and flow induced microdomain ordering of a confined structured liquid that is dewetting a solid substrate. The microdomains emerge, since the two blocks of the copolymer poly(styrene-ethylene/propylene) are incompatible and phase separate. The equilibrium film structure shows lamellae which are aligned parallel to the substrate. We find that dewetting induced shear causes a structural rearrangement of the microdomains into cylinders. AFM observations furthermore show that the dewetting process can be separated into two distinct stages. The first stage is characterized by round hole formation and structural rearrangements of the domains. The second stage of dewetting is defined by an irregular hole shape and the alignment of the microdomain structure along the three phase contact line. Additional to the experiments on the polymer surface we present AFM scans of the film-substrate interface. Effects due to slippage of the melt are apparent.