Advanced techniques for nanocharacterization of polymeric coating surfaces |
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Authors: | Gu Xiaohong Nguyen Tinh Sung Li-Piin VanLandingham Mark R. Fasolka Michael J. Martin Jonathan W. Jean Y. C. Nguyen Diep Chang Nei-Kai Wu Tsun-Yen |
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Affiliation: | (1) National Institute of Standards and Technology, 20899 Gaithersburg, MD;(2) University of Missouri-Kansas City, 64110 Kansas City, MO;(3) PPG Industries, Inc., 15101 Allison Park, PA;(4) Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan;(5) Present address: Army Research Laboratory, 21005 Aberdeen Proving Ground, MD |
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Abstract: | Surface properties of a polymeric coating system have a strong influence on its performance and service life. However, the surface of a polymer coating may have different chemical, physical, and mechanical properties from the bulk. In order to monitor the coating property changes with environmental exposures from the early stages of degradation, nondestructive techniques with the ability to characterize surface properties with micro- to nanoscale spatial resolution are required. In this article, atomic force microscopy has been applied to study surface microstructure and morphological changes during degradation in polymer coatings. Additionally, the use of AFM with a controlled tip-sample environment to study nanochemical heterogeneity and the application of nanoindentation to characterize mechanical properties of coatings surfaces are demonstrated. The results obtained from these nanometer characterization techniques will provide a better understanding of the degradation mechanisms and a fundamental basis for predicting the service life of polymer coatings. Presented at the 81st Annual Meeting of the Federation of Societies for Coatings Technology on November 12–14, 2003, in Philadelphia, PA. |
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Keywords: | Atomic force surface analysis interface analysis epoxy resins fluorinated polymers hardness scratch resistance service life prediction surface chemistry morphology |
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