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Modulus Determination of Polymer Matrix Composites: Comparison of Nanoindentation and Dynamic Mechanical Analysis

Published online by Cambridge University Press:  17 March 2011

Jaime C. Grunlan ,
David Rowenhorst ,
Lorraine F. Francis  and
William W. Gerberich
Jaime C. Grunlan
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota 151 Amundson Hall (Box 69), 421 Washington Ave SE, Minneapolis, MN 55455, U.S.A.
David Rowenhorst
Affiliation:
Materials Science and Engineering Department, Northwestern University 2225 N. Campus Drive, Evanston, IL 60208, U.S.A.
Lorraine F. Francis
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota 151 Amundson Hall, 421 Washington Ave SE, Minneapolis, MN 55455, U.S.A.
William W. Gerberich
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota 151 Amundson Hall, 421 Washington Ave SE, Minneapolis, MN 55455, U.S.A.
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Abstract

The results of modulus measurements, on carbon black-filled poly(N-vinylpyrrolidone), using dynamic mechanical analysis and nanoindentation were compared. It was shown that beyond the critical pigment volume concentration for this composite system (∼ 25 vol% carbon black), the storage modulus, obtained with dynamic mechanical analysis, decreased with increasing filler concentration. This dropping modulus was due to porosity that developed in the composite films when the critical pigment volume concentration had been exceeded. Elastic modulus obtained with nanoindentation showed the opposite trend, with modulus increasing with additional carbon black loading. An analysis of the method used to calculate modulus based upon indentation data was performed and a mechanism was proposed to explain the disparity between the moduli obtained using these two different methods of measurement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 649: Symposium Q – Fundamentals of Nanoindentation & Nanotribology II , 2000 , Q3.5
Copyright
Copyright © Materials Research Society 2001

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References

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