Influence of grafting density on wall slip of a polymer melt on a polymer brush

E. Durliat; H. Hervet; L. Leger

doi:10.1209/epl/i1997-00255-3

All issues

Volume 38 / No 5 (May II 1997)

Europhys. Lett., 38 5 (1997) 383-388

Abstract

Issue		Europhys. Lett. Volume 38, Number 5, May II 1997


Page(s)		383 - 388
Section		Cross-disciplinary physics and related areas of science and technology
DOI		https://doi.org/10.1209/epl/i1997-00255-3
Published online		01 September 2002

Europhys. Lett., 38 (5), pp. 383-388 (1997)

Influence of grafting density on wall slip of a polymer melt on a polymer brush

E. Durliat, H. Hervet and L. Leger

Laboratoire de Physique de la Matière Condensée, URA CNRS 792, Collège de France - 11 place M. Berthelot, 75231 Paris Cedex 05, France

Received: 26 July 1996
Accepted: 24 March 1997

Abstract

We have investigated the shear flow of a polydimethylsiloxane (PDMS) melt on a PDMS brush of well-controlled density. As the shear rate, $\dot\gamma$ , is increased, we show the existence of a slip transition from a weak slip regime, where the extrapolation length of the velocity profile, b, is a constant b₀, to a strong one, where $\dot\gamma$ sticks to its value at the transition $\dot\gamma^\star$ . We discuss the influence of the grafting density ${\mit\Sigma}$ on b₀ and $\dot\gamma^\star$ . We compare our results with a recent microscopic model.

PACS: 83.10.Nn – Polymer dynamics / 83.50.Lh – Interfacial and free surface flows; slip

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