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Published January 9, 2004 | public
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Molecular Origin and Dynamic Behavior of Slip in Sheared Polymer Films


The behavior of the slip length in thin polymer films subject to planar shear is investigated using molecular dynamics simulations. At low shear rates, the slip length extracted from the velocity profiles correlates well with that computed from a Green-Kubo analysis. Beyond chain lengths of about N = 10, the molecular weight dependence of the slip length is dominated strongly by the bulk viscosity. The dynamical response of the slip length with increasing shear rate is well captured by a power law up to a critical value where the momentum transfer between wall and fluid reaches its maximum.

Additional Information

©2004 The American Physical Society (Received 21 April 2003; published 7 January 2004) The authors thank Dr. P. A. Thompson of PeerMedia, Inc. for kindly sharing his source code and for helpful discussions. The authors also thank Professor Roberto Car for computational support and useful conversations. Financial support by the National Science Foundation (CTS and DMR divisions), by Unilever Research U.S., by the U.S. Army (TACOM, ARDEC), and NASA is gratefully acknowledged.


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