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http://hdl.handle.net/10397/7019
Title: | Crossover to surface flow in supercooled unentangled polymer films | Authors: | Lam, CH Tsui, OKC |
Issue Date: | Oct-2013 | Source: | Physical review. E, Statistical, nonlinear, and soft matter physics, Oct. 2013, v. 88, no. 4, 042604, p. 1-6 | 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. | Keywords: | Glass Laminar flow Molecular dynamics Semiconducting films |
Publisher: | American Physical Society | Journal: | Physical review. E, Statistical, nonlinear, and soft matter physics | 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/ |
Appears in Collections: | Journal/Magazine Article |
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File | Description | Size | Format | |
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Lam_Crossover_Supercooled_Film.pdf | 1.11 MB | Adobe PDF | View/Open |
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