Adsorption-induced slip inhibition for polymer melts on ideal substrates

Mark Ilton, Thomas Salez, Paul D. Fowler, Marco Rivetti, Mohammed Aly, Michael Benzaquen, Joshua D. McGraw, Elie Raphaël, Kari Dalnoki-Veress and Oliver Bäumchen ()
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Mark Ilton: McMaster University
Thomas Salez: Univ. Bordeaux, CNRS, LOMA, UMR 5798
Paul D. Fowler: McMaster University
Marco Rivetti: Max Planck Institute for Dynamics and Self-Organization (MPIDS)
Mohammed Aly: Ecole Normale Supérieure/PSL Research University
Michael Benzaquen: UMR CNRS Gulliver 7083, ESPCI Paris, PSL Research University
Joshua D. McGraw: McMaster University
Elie Raphaël: UMR CNRS Gulliver 7083, ESPCI Paris, PSL Research University
Kari Dalnoki-Veress: McMaster University
Oliver Bäumchen: Max Planck Institute for Dynamics and Self-Organization (MPIDS)

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Hydrodynamic slip, the motion of a liquid along a solid surface, represents a fundamental phenomenon in fluid dynamics that governs liquid transport at small scales. For polymeric liquids, de Gennes predicted that the Navier boundary condition together with polymer reptation implies extraordinarily large interfacial slip for entangled polymer melts on ideal surfaces; this Navier-de Gennes model was confirmed using dewetting experiments on ultra-smooth, low-energy substrates. Here, we use capillary leveling—surface tension driven flow of films with initially non-uniform thickness—of polymeric films on these same substrates. Measurement of the slip length from a robust one parameter fit to a lubrication model is achieved. We show that at the low shear rates involved in leveling experiments as compared to dewetting ones, the employed substrates can no longer be considered ideal. The data is instead consistent with a model that includes physical adsorption of polymer chains at the solid/liquid interface.

Date: 2018
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DOI: 10.1038/s41467-018-03610-4

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