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Nanoindentation of Viscoelastic Materials: Mechanical Properties of Polymer Coatings on Aluminum Substrates

Published online by Cambridge University Press:  10 February 2011

K. B. Yoder ,
S. Ahuja ,
K. T. Dihn ,
D. A. Crowson ,
S. G. Corcoran ,
L. Cheng  and
W. W. Gerberich
K. B. Yoder
Affiliation:
CEMS Department, University of Minnesota, Minneapolis, MN
S. Ahuja
Affiliation:
Xerox Corporation, Webster, NY
K. T. Dihn
Affiliation:
Xerox Corporation, Webster, NY
D. A. Crowson
Affiliation:
Hysitron Incorporated, Minneapolis, MN
S. G. Corcoran
Affiliation:
Hysitron Incorporated, Minneapolis, MN
L. Cheng
Affiliation:
CEMS Department, University of Minnesota, Minneapolis, MN
W. W. Gerberich
Affiliation:
CEMS Department, University of Minnesota, Minneapolis, MN
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Abstract

The mechanical properties of four polymer coatings on aluminum foil substrates are examined using nanoindentation with a Hysitron Triboscope, an add-on to an AFM. In addition to static hardness and modulus measurements, the viscoelastic properties of the films, which differ in Tg and extent of crosslinking, are investigated by employing two techniques: using nanoindentation parameters to fit the creep response of the material to a one-dimensional equation based on a three-element Zener model of the viscoelastic behavior of the polymer; and fitting the creep response of the material to a previously developed, three-dimensional model of the response of a viscoelastic material to indentation by a spherical indenter. It is found that the measured static moduli are about 1.5 times greater than results of fitting creep data to the 1-D model, and are a factor of 3–6 times greater than those obtained by fits of the 3-D model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 205
Copyright
Copyright © Materials Research Society 1998

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