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Title: Enhanced stiffness of amorphous polymer surfaces under confinement of localized contact loads
Authors: Constantinides, Georgios 
Tweedie, Catherine A. 
Lehman, Karl E. 
Keywords: Polymers
Surface tension
Temperature measurements
Open access publishing
Issue Date: 2007
Publisher: Wiley
Source: Advanced Materials,2007, Volume 19, Issue 18, Pages 2540-2546
Abstract: The apparent stiffness of various amorphous polymer surfaces at room temperature was measured in response to five maximum indentation loads imposed through two well-characterized conospherical diamond probes. These maximum loads correspond to indentation contact depths hc, ranging from 5nm to >100nm from the free surface. The enhanced apparent stiffness near the surface is recognized as a result of an interface formed at the contact surface confined between the polymers and the diamond probe. Four different processing and thermal history routes were employed, including compression molding (CM), injection molding (IM), spin coating (SC), and annealing after spin coating (SC-A) for PS and PMMA. The results provide the basis for isolating the effects of mechanical compression/confinement and of probe surface chemistry in the mechanical behavior of polymer surfaces under localized contact.
ISSN: 0935-9648
DOI: 10.1002/adma.200602846
Rights: © 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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