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Three-dimensional microscale flow of polymer coatings on glass during indentation

  • L. R. Bartell (a1), N. Y. C. Lin (a2), J. L. Lyon (a3), M. L. Sorensen (a3), D. A. Clark (a3), M. J. Lockhart (a3), J. R. Matthews (a3), G. S. Glaesemann (a3), M. E. DeRosa (a3) and I. Cohen (a2)...
Abstract
Abstract

We present an indentation-scope that interfaces with confocal microscopy, enabling direct observation of the three-dimensional (3D) microstructural response of coatings on substrates. Using this method, we compared microns-thick polymer coatings on glass with and without silica nanoparticle filler. Bulk force data confirmed the >30% modulus difference, while microstructural data further revealed slip at the glass-coating interface. Filled coatings slipped more and about two times faster, as reflected in 3D displacement and von Mises strain fields. Overall, these data indicate that silica-doping of coatings can dramatically alter adhesion. Moreover, this method compliments existing theoretical and modeling approaches for studying indentation in layered systems.

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*Address all correspondence to Lena R. Bartell at lrb89@cornell.edu
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