Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 26, Issue 22, Pages 1800-1804Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.200500538
Keywords
atomic force microscopy (AFM); elastic modulus; mechanical properties; nanoindentation; polymer
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The nanoindentation test is a fundamental tool to assess the link between morphology and mechanical properties. The preliminary results of a more exhaustive study about the applicability to polymers of the most used procedure to determine elastic modulus by indentation are reported in this short communication. A departure of the experimental conditions from the theoretical assumptions and results that give rise to the Oliver and Pharr analysis is shown to occur under a wide range of experimental conditions, with applied loads and penetration depths covering several orders of magnitude and using different indenter geometries. Unloading curves with exponents significantly larger than 2 are observed in disagreement with the contact mechanics approach used by Oliver and Pharr.
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