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
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