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.

[1]  Rajesh Khare,et al.  Rheology of Confined Polymer Melts , 1996 .

[2]  Structure and Shear Response in Nanometer-Thick Films , 1995, mtrl-th/9503002.

[3]  Migler,et al.  Slip transition of a polymer melt under shear stress. , 1993, Physical review letters.

[4]  L. Bocquet,et al.  Hydrodynamic boundary conditions, correlation functions, and Kubo relations for confined fluids. , 1994, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[5]  R. Bird.  Dynamics of Polymeric Liquids , 1977 .

[6]  Roger I. Tanner,et al.  Wall slip in the molecular dynamics simulation of thin films of hexadecane , 1999 .

[7]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[8]  G. Grest,et al.  Dynamics of entangled linear polymer melts: A molecular‐dynamics simulation , 1990 .

[9]  R. Larson.  The Structure and Rheology of Complex Fluids , 1998 .

[10]  S. Granick,et al.  Rate-dependent slip of Newtonian liquid at smooth surfaces. , 2001, Physical review letters.

[11]  S. Burgard.  ISR , 1999 .

[12]  B. Ninham,et al.  Submicrocavity Structure of Water between Hydrophobic and Hydrophilic Walls as Revealed by Optical Cavitation , 1995 .

[13]  Robbins,et al.  Phase transitions and universal dynamics in confined films. , 1992, Physical review letters.

[14]  S. Richardson,et al.  On the no-slip boundary condition , 1973, Journal of Fluid Mechanics.

[15]  T. Blake,et al.  Slip between a liquid and a solid: D.M. Tolstoi's (1952) theory reconsidered , 1990 .

[16]  Matthew Tirrell,et al.  Molecular dynamics of flow in micropores , 1987 .

[17]  Lydéric Bocquet,et al.  Large Slip Effect at a Nonwetting Fluid-Solid Interface , 1999 .

[18]  S. Troian,et al.  A general boundary condition for liquid flow at solid surfaces , 1997, Nature.

[19]  J. Kirkwood,et al.  Theory of liquids , 1968 .

[20]  Olga I. Vinogradova,et al.  Hydrodynamic slippage inferred from thin film drainage measurements in a solution of nonadsorbing polymer , 2000 .

[21]  J. Banavar,et al.  Computer Simulation of Liquids , 1988 .

[22]  Jean-Louis Barrat,et al.  Influence of wetting properties on hydrodynamic boundary conditions at a fluid/solid interface , 1998 .

[23]  C. Tanford.  Macromolecules , 1994, Nature.

[24]  H. D. Cochran,et al.  Comparison of shear flow of hexadecane in a confined geometry and in bulk , 1997 .

[25]  Robbins,et al.  Shear flow near solids: Epitaxial order and flow boundary conditions. , 1990, Physical review. A, Atomic, molecular, and optical physics.

[26]  Kremer,et al.  Molecular dynamics simulation for polymers in the presence of a heat bath. , 1986, Physical review. A, General physics.

[27]  H. Temperley.  The Theory of Liquids , 1950, Nature.