| Issue |
Europhys. Lett.
Volume 43, Number 1, July I 1998
|
|
|---|---|---|
| Page(s) | 83 - 88 | |
| Section | Cross-disciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i1998-00323-8 | |
| Published online | 01 September 2002 | |
Investigation of the slip transition at the melt polymer interface
Laboratoire de Physique de la Matière Condensée, URA CNRS 792, Collège de France, 11 Place Marcelin Berthelot, 75231
Paris Cedex 05, France
Received:
26
January
1998
Accepted:
14
May
1998
We present a detailed experimental investigation of the effect of molecular
parameters on the onset of strong slip at the wall for polydimethylsiloxane
melts flowing against silica surfaces on which a weak density of polymer
chains are anchored by adsorption. The observed variation of the critical
velocity for the onset of strong slip 
, with N and P the polymerisation
indices of surface and bulk chains, respectively, and the wide range of the
non-linear friction regime above V* strongly support the description of the
dynamic de-coupling between the surface and bulk chains in terms of progressive
disentanglement.
PACS: 83.10.Nn – Polymer dynamics / 83.50.Lh – Interfacial and free surface flows; slip / 68.10.-m – Fluid surfaces and fluid-fluid interfaces
© EDP Sciences, 1998
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