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Viscoelastric Properties of Confined Polymer Layers

Published online by Cambridge University Press:  15 February 2011

Bernard A. Costello  and
Paul F. Luckham
Bernard A. Costello
Affiliation:
Department of Chemical Engineering and Chemical Technology, Imperial College, Prince Consort Road, London S.W.7 2BY. United Kingdom.
Paul F. Luckham
Affiliation:
Department of Chemical Engineering and Chemical Technology, Imperial College, Prince Consort Road, London S.W.7 2BY. United Kingdom.
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Abstract

The viscoelastic properties of thin films of graft copolymers of poly (hydroxy stearic acid)/poly (methyl methacrylate) adsorbed on mica surfaces have been investigated by oscillating one surface sinusoidally using a piezoelectric crystal and monitoring the response of the other on a piezo bimorph. Two distinct regions were found. At low separations the viscous response was negligible, although equilibrium force / distance profiles clearly showed that fluid could be squeezed from the intersurface gap. This was ascribed to hydrodynamic effects, the time scale of the dynamic experiments being much shorter than the equilibrium experiments. Several ways of investigating these effects further have been proposed. At larger separations the viscosity of the medium achieved its bulk value, as expected.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 289: Symposium M – Flow and Microstructure of Dense Suspensions , 1992 , 7
Copyright
Copyright © Materials Research Society 1993

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