Influence of grafting density on wall slip of a polymer melt on a polymer brush
Laboratoire de Physique de la Matière Condensée, URA CNRS 792, Collège de France - 11 place M. Berthelot, 75231 Paris Cedex 05, France
Accepted: 24 March 1997
We have investigated the shear flow of a polydimethylsiloxane (PDMS) melt on a PDMS brush of well-controlled density. As the shear rate, , 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 sticks to its value at the transition . We discuss the influence of the grafting density on b0 and . We compare our results with a recent microscopic model.
PACS: 83.10.Nn – Polymer dynamics / 83.50.Lh – Interfacial and free surface flows; slip
© EDP Sciences, 1997