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Thermal-induced recovery of small deformations and degradation defects on epoxy coating surface

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Abstract

Surface defects, which are dependent on the surface properties, determine the appearance, toughness, and other properties of coatings; thus, changes to the morphology of a damaged epoxy coating surface were investigated on annealing. Changes in mechanically produced indentations and scratches with annealing indicate a surface transition temperature about 10 degree lower than the measured bulk glass transition temperature (T g). Polymer molecules at a free surface, even in a crosslinked coating, may have higher mobility, and thus allow different relaxation activity from the bulk material. The eventual extent of deformation is a function of the annealing temperature and time. Results showed that the deformation profile diminished, driven by viscoelastic deformation and surface energy; the effect of structural relaxation will be further studied. When the surface features were generated by photodegradation, the roughness increased initially when temperature was increased, possibly due to phase coarsening, and then the roughness diminished during extended annealing.

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Acknowledgments

The authors would like to thank the US Air Force Office of Scientific Research for funding this research. We thank Brad Halverson from the NDSU Center for Nanoscale Science and Engineering (CNSE) for his aid in the use of the Hysitron nanoindentor.

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Authors and Affiliations

  1. Department of Coatings and Polymeric Materials, North Dakota State University (NDSU), Fargo, ND, 58105, USA

    Xiaodong Shi & Stuart G. Croll

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  1. Xiaodong Shi
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  2. Stuart G. Croll
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Correspondence to Stuart G. Croll.

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Shi, X., Croll, S.G. Thermal-induced recovery of small deformations and degradation defects on epoxy coating surface. J Coat Technol Res 7, 73–84 (2010). https://doi.org/10.1007/s11998-009-9176-2

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