Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Poster: Confinement of Polymers in Nanoscopic Layers - How Much do Properties Change?

CPP 21.8: Poster

Dienstag, 15. März 2011, 18:00–20:00, P2

Fluidics of confined liquid films: Impact of slippage on spinodal dewetting — •Matthias Lessel, Oliver Bäumchen, Sabrina Häfner, and Karin Jacobs — Department of Experimental Physics, Saarland University, D-66041 Saarbrücken, Germany

We investigate the dewetting dynamics of short-chained polystyrene (PS) films with thicknesses in the range of a few nanometers. According to the stability criteria derived from the effective interface potential, capillary waves are amplified and cause film thickness variations, a scenario termed spinodal dewetting. By in situ AFM investigations, the dynamics of spinodal dewetting is quantified [1, 2]. Due to confinement of the polymer in a thin film, physical properties such as the glass transition temperature change compared to the bulk properties. Recently, Yang et al. [3] were able to provide evidence for a highly mobile surface layer at the air/liquid interface of unentangled PS films. Bäumchen et al. showed for entangled PS films that the inter-chain entaglement density is reduced close to the interface [4]. An interfacial layer is capable to influence significantly the flow dynamics of the polymer. Polymer dewetting is studied by using substrates with different hydrophobic coatings like self-assembled monolayers of silanes or an amorphous fluoropolymer (AF 1600) coating.

[1] R. Seemann et al., Phys. Rev. Lett., 86 (2001), 5534.

[2] R. Fetzer et al., Phys. Rev. Lett., 99 (2007), 114503.

[3] Z. Yang et al., Science, 328 (2010), 1676.

[4] O. Bäumchen et al., Phys. Rev. Lett. 103 (2009) 247801.