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Analysis of the Elastic Modulus of a Thin Polymer Film

Published online by Cambridge University Press:  10 February 2011

S. Roche ,
S. Bec  and
J.L. Loubet
S. Roche
Affiliation:
Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513, 36, avenue Guy de Collongue, 69134 Ecully, FRANCE
S. Bec
Affiliation:
Ecole Centrale de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513, 36, avenue Guy de Collongue, 69134 Ecully, FRANCE
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Abstract

This paper discusses the interaction between mechanical properties of a thin layer and those of its substrate. The underlined questions are: how the substrate's mechanical properties affect those of the film; how the layer's thickness affects its mechanical properties. Nanoindentation tests were performed on polymer films of different thicknesses deposited onto a silica substrate. The mechanical response of such a system is known to be a composite response (film+substrate). Our aim is to understand the elastic behavior of the film inside this structure.

Model was used to estimate the elastic modulus of the film from the global measured value. For thin and “compliant” polymer layers deposited on “hard” substrates, an increase of the film elastic modulus was observed along indentation. We attribute this increase to the “anvil effect”: the bulk elastic modulus increases with the hydrostatic pressure which results from the compression of the film. In conclusion, one first interpretation is proposed to understand specific behavior of thin soft polymer layers on rigid substrates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 778: Symposium U – Mechanical Properties Derived from Nanostructuring Materials , 2003 , U4.8
Copyright
Copyright © Materials Research Society 2002

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