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Publication Citation: Instrumented Indentation for Quantifying Quasi-static and Transient Properties of Polymeric Coatings

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Author(s): Aaron M. Forster; Peter Krommenhoek; Li Piin Sung; Chris A. Michaels; Kurt Wood;
Title: Instrumented Indentation for Quantifying Quasi-static and Transient Properties of Polymeric Coatings
Published: November 26, 2008
Abstract: Instrumented indentation was used to investigate the mechanical properties of coatings for automotive and architectural applications. First, the mechanical properties in the cross-section of a multi-layer acrylic-melamine automotive coating subjected to different processing steps were quantified. Indentation was able to distinguish the individual coating layers and showed that the interface between each layer was sharp on the 1 m measurement scale. This was confirmed by Raman line scan measurements. Indentation measurements showed that processing conditions did not impact the coating mechanical properties at the 1 m length scale. Second, the mechanical properties of a poly(vinylidene-fluoride-co-hexafluoropropylene) and a poly(methacrylate-co-ethyl acrylate) polymer blend, an architectural coating formulation, were characterized. Indentation measurements qualitatively agreed with DMA measurements of the modulus of the samples. It was shown that a threshold mass fraction of acrylic copolymer was required to increase the modulus of the blend, while the hardness of the sample continually increased with increased acrylic content. The creep behavior of these blends was measured and qualitatively analyzed by fitting a power law model.
Conference: FutureCoat!2008 "Globally Responsible Coatings: Getting There from Here"
Proceedings: Instrumented Indentation for Quantifying Quasi-static and Transient Properties of Polymeric Coatings
Location: Chicago, IL
Dates: October 15-16, 2008
Keywords: nanoindentation; raman microscopy; automotive coatings; polymer blends; creep
Research Areas: Coatings/Sealants
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