Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23470
Title: Viscosity and Surface-Promoted Slippage of Thin Polymer Films Supported by a Solid Substrate
Authors: Chen, F
Peng, D
Lam, CH 
Tsui, OKC
Issue Date: 2015
Publisher: American Chemical Society
Source: Macromolecules, 2015, v. 48, no. 14, p. 5034-5039 How to cite?
Journal: Macromolecules 
Abstract: Thermally activated flow dynamics of polystyrene films supported by silicon is studied for a wide range of film thickness (h0) and molecular weights (Mw). At low Mw, the effective viscosity of the nanometer thin films is smaller than the bulk and decreases with decreasing h0. This is due to enhancement of the total shear flow by the augmented mobility at the free surface. As Mw increases, with h0 becoming smaller than the polymer radius of gyration (Rg), the effective viscosity switches from being substrate-independent to substrate-dependent. We propose that interfacial slippage then dominates and leads to plug flow. The friction coefficient is found to increase with h0 providing h0/Rg < ∼1, demonstrating a surface-promoted confinement effect.
URI: http://hdl.handle.net/10397/23470
ISSN: 0024-9297
DOI: 10.1021/acs.macromol.5b01002
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