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Reduced interfacial entanglement density affects the boundary conditions of polymer flow

MPG-Autoren
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Bäumchen,  Oliver
Group Dynamics of fluid and biological interfaces, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Zitation

Bäumchen, O., Fetzer, R., & Jacobs, K. (2009). Reduced interfacial entanglement density affects the boundary conditions of polymer flow. Physical Review Letters, 103(24): 247801. doi:10.1103/PhysRevLett.103.247801.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0029-774F-0
Zusammenfassung
Hydrodynamic boundary conditions play a crucial role in the flow dynamics of thin films and can be probed by the analysis of liquid front profiles. 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. Variation of molecular weight shows that slippage is directly linked to chain entanglements. We find a reduced entanglement density at the solid-liquid interface (factors 3 to 4), which stresses the importance of considering nonbulk polymer properties in the vicinity of an interface.