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Molecular organization and viscosity of a thin film of molten polymer between two surfaces as probed by force measurements

Horn, R. G. and Israelachvili, J. N. 1988, Molecular organization and viscosity of a thin film of molten polymer between two surfaces as probed by force measurements, Macromolecules, vol. 21, no. 9, pp. 2836-2841, doi: 10.1021/ma00187a032.

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Title Molecular organization and viscosity of a thin film of molten polymer between two surfaces as probed by force measurements
Author(s) Horn, R. G.
Israelachvili, J. N.
Journal name Macromolecules
Volume number 21
Issue number 9
Start page 2836
End page 2841
Total pages 6
Publisher American Chemical Society
Place of publication Washington, D.C.
Publication date 1988-09
ISSN 0024-9297
1520-5835
Keyword(s) Liquids--Viscosity
Molecules
Plastics--Thin Films
Polymers--Solutions
Solids--Surfaces
Summary Measurements are presented of the force between two molecularly smooth mica surfaces immersed in liquid poly(dimethylsiloxane) (Dow Corning 200 of nominal viscosity 50 cS) over a range of film thicknesses from 3 to 200 nm. There is a repulsion, attributed to conformational restrictions, when the polymer molecules are confined to a gap less than about 15 nm thick. In extremely thin films (<5 nm) the force is an oscillatory function of thickness with a repeat spacing corresponding to the width of the polymer molecule, which suggests that the polymer segments are arranged in layers near the solid surfaces. Dynamic force measurements show that the polymer has a viscosity equal to its bulk value even in very thin films, but a region next to each surface, only about one radius of gyration thick, does not flow. Saturation of the polymer with water destabilizes the film when it is very thin.
Language eng
DOI 10.1021/ma00187a032
Field of Research 029999 Physical Sciences not elsewhere classified
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1988, American Chemical Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30041463

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