Liquid Front Profiles Affected by Entanglement-induced Slippage

Details Liquid Front Profiles Affected by Entanglement-induced Slippage Liquid Front Profiles Affected by Entanglement-induced Slippage

2009-07-13

arxiv.org/abs/0907.2113v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures

Scientific paper

Hydrodynamic slippage plays a crucial role in the flow dynamics of thin polymer films, as recently shown by the analysis of the profiles of liquid fronts. For long-chained polymer films it was reported that a deviation from a symmetric profile is a result of viscoelastic effects. In this Letter, however, evidence is given that merely a slip boundary condition at the solid/liquid interface can lead to an asymmetric profile. Dewetting experiments of entangled polymer melts on diverse substrates allow a direct comparison of rim morphologies. Variation of molecular weight Mw clearly reveals that slippage increases dramatically above a certain Mw and governs the shape of the rim. The results are in accordance with the theoretical description by de Gennes.

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