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- W1823323924 abstract "The flow velocity at the solid wall is measured directly for polymer melts submitted to a shear stress, using a novel near field velocimetry technique. The control of the polymer-surface interactions, and especially of the density of polymer chains able to adsorb strongly at the wall to form an anchored surface layer, has allowed a systematic investigation of the molecular mechanisms at the origin of the appearance of slip boundary conditions for the flow. For smooth surfaces with a very weak roughness, the key parameters that control the boundary condition for the flow velocity are: (1) the degree of interdigitation between the surface anchored polymer layer and the flowing melt and (2) the aptitude of the surface chains to deform under the solicitation of the shear force. These two effects are competing: interdigitation and entanglements between the surface chains and the bulk liquid lead to a large friction, and tend to suppress the slip that high molecular weight polymers should exhibit on an ideal plane and nonadsorbing surface, while the deformation of the surface chains under the effect of the flow tends to decouple the surface layer from the bulk fluid and to decrease the friction." @default.
- W1823323924 created "2016-06-24" @default.
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- W1823323924 date "1996-01-01" @default.
- W1823323924 modified "2023-09-27" @default.
- W1823323924 title "Slip at the wall" @default.
- W1823323924 doi "https://doi.org/10.1016/s0169-3107(96)80012-8" @default.
- W1823323924 hasPublicationYear "1996" @default.
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