Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/7019
Title: Crossover to surface flow in supercooled unentangled polymer films
Authors: Lam, CH 
Tsui, OKC
Keywords: Glass
Laminar flow
Molecular dynamics
Semiconducting films
Issue Date: Oct-2013
Publisher: American Physical Society
Source: Physical review. E, Statistical, nonlinear, and soft matter physics, Oct. 2013, v. 88, no. 4, 042604, p. 1-6 How to cite?
Journal: Physical review. E, Statistical, nonlinear, and soft matter physics 
Abstract: We study the driven flow of an unentangled glassy polymer film with a free upper surface and supported below by a substrate using nonequilibrium molecular dynamics simulations based on a bead-spring model. Above the glass transition temperature T [subscript g] , simple Poiseuille laminar flow is observed with the film mobility defined as the flow current density per unit pressure gradient scaling as h³ with the film thickness h . Below T [subscript g] , the film mobility becomes independent of h , signifying surface transport. This is in full agreement with recent experiments on the time evolution of capillary waves in polystyrene films supported by silica. A mobile layer is found responsible for the surface transport, as previously conjectured. Our result also shows that it has a velocity profile decaying exponentially into the bulk.
URI: http://hdl.handle.net/10397/7019
ISSN: 1539-3755
EISSN: 1550-2376
DOI: 10.1103/PhysRevE.88.042604
Rights: Physical Review E © 2013 The American Physical Society. The Journal's web site is located at http://pre.aps.org/
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