Scratch behavior of nano-alumina/polyurethane coatings |
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| Authors: | Li-Piin Sung Jeffrey Comer Aaron M. Forster Haiqing Hu Bryce Floryancic Lukas Brickweg Raymond H. Fernando |
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| Affiliation: | (1) Polymeric materials Group, Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;(2) California Polytechnic State University, San Luis Obispo, CA, USA |
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| Abstract: | Incorporating metal-oxide nanoparticles such as nano-alumina and nano-silica into polymer coatings to enhance mechanical durability
is widely utilized in the current antiscratch and mar technologies. In this article, a quantitative study of the effect of
a nano-alumina additive on the surface mechanical properties and scratch behavior of a two-part polyurethane coating is reported.
An instrumented indenter with a conical diamond tip is used to measure surface mechanical properties (modulus and hardness)
and to perform scratch tests, over a wide range of scratch loads. The scratch behavior in terms of the onset of elastic–plastic
transition and scratch morphology were characterized by laser scanning confocal microscopy. The scratch results were correlated
to the surface mechanical properties and relevant bulk material properties to understand the overall scratch behavior of the
coatings. The results show that the scratch behavior of the coatings depends strongly on the concentration of nano-alumina.
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| Keywords: | Glass transition temperature Laser scanning confocal microscopy Mechanical properties Nanoindentation Nanoparticles Scratch behavior Surface morphology |
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