Regensburg 2007 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 19: POSTER: Micro and Nano Fluidics

CPP 19.20: Poster

Wednesday, March 28, 2007, 16:00–18:30, Poster B

Thin liquid polymer films: Preparation parameters impact polymer dynamics — •Ludovic Marquant, Daniel Podzimek, Renate Fetzer, and Karin Jacobs — Saarland University, Experimental Physics, D-66041 Saarbrücken, Germany

The dynamics of polymer films dewetting from hydrophobic substrates can be influenced by several phenomena. First the impact of the boundary conditions can be developed. When we observe the profile of a growing rim of polystyrene film dewetting either from octadecyltrichlorosilane or dodecyltrichlorosilane (respectively OTS and DTS) bounded to a silicon wafer, we can observe that the slip length is varying in both cases and the dewetting process is significantly faster on DTS than on OTS brushes [1]. One other important phenomenon we focus on is the polymer chain dynamics. The influence of different conformations of the macromolecules within the solvent used for spin-coating is investigated by acting on the polymer / solvent interaction. In other words the use of a range from good to theta solvents allows us to analyse the properties of the polymer coating. The films are prepared with a thickness in a range of several tens up to several hundreds of nanometres. The methodologies developed are scanning probe microscopy, ellipsometry and optical microscopy.

[1] R. Fetzer, M. Rauscher, A. Münch, B. A. Wagner and K. Jacobs, Europhysics Letters 75 (2006) 638