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Publication Citation: Elastic Modulus Characterization of Nanocomposite Latex Coatings

NIST Authors in Bold

Author(s): Aaron M. Forster; Stephanie S. Watson; Jonathan White;
Title: Elastic Modulus Characterization of Nanocomposite Latex Coatings
Published: September 24, 2008
Abstract: The elastic modulus of a polystyrene-butyl acrylate latex coating was measured using three different techniques: instrumented indentation, dynamic mechanical analysis, and tensile testing. The coating was formulated with 25 nm and 250 nm diameter TiO2 particles at three different pigment volume concentrations (PVC). Additional coatings were formulated with sol-gel created TiO2 and ZnO particles at 2.5 % PVC. Indentation consistently measured a higher modulus than DMA or tensile testing. All three metrologies agreed after the elastic modulus was normalized by the unfilled coating modulus. Nanoparticles produced less of an improvement in the elastic modulus than 250 nm particles. Existing theoretical models for normalized modulus were used to infer the particle dispersion in the coating.
Citation: Nanotechnology Applications in Coatings
Publisher: Oxford University Press, New York, NY
Keywords: latex, nanoparticles, titanium dioxide, zinc oxide, mechanical properties, nanoindentation
Research Areas: Building Materials