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UV-waterborne polyurethane-acrylate nanocomposite coatings containing alumina and silica nanoparticles for wood: mechanical, optical, and thermal properties assessment

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Abstract

The effect of alumina and silica nanoparticles on mechanical, optical, and thermal properties of UV-waterborne nanocomposite coatings was investigated. The addition of nanoalumina and nanosilica was shown to decrease the hardness because of nanoparticle aggregation. In comparison to the neat coating and despite the presence of aggregates, the scratch resistance of nanocomposite coatings was significantly improved. As expected, the gloss of UV-waterborne coatings was reduced following the addition of nanoparticles due to an increase of the surface roughness. Alumina and silica nanoparticles were found to enhance the glass transition temperature of PUA nanocomposite coatings by hindering the mobility of macromolecular chains at the interface around the nanoparticles. Finally, the interest and efficiency of grafting trialkoxysilanes was demonstrated with the study of nanosilica behavior. Not only was the dispersion of nanosilica enhanced following trialkoxysilanes grafting onto silica nanoparticles, but also the scratch resistance and the adhesion of UV-waterborne coatings containing nanosilica markedly increased even with 1 wt% content. Silica which is recommended in the wooden furniture and kitchen cabinet manufacturing industry as nano-reinforcement provides improved properties well suited in surface coating applications to efficiently protect surface of wood substrates.

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Acknowledgments

The authors express their gratitude to Economic Development Canada, the Fond Québécois de Recherche sur la Nature et les Technologies and FPInnovations for their financial support. We would like to thank Can-Lak our coating partner in this project. Material support from BYK-Chemie and Ciba Specialty Chemicals is gratefully acknowledged.

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Authors and Affiliations

  1. Département des sciences du bois et de la forêt, Centre de recherche sur le bois, Université Laval, Quebec, QC, G1V 0A6, Canada

    Caroline Sow, Bernard Riedl & Pierre Blanchet

  2. FPInnovations, Nanotechnologies for Wood Products, Quebec, QC, G1P 4R4, Canada

    Pierre Blanchet

Authors
  1. Caroline Sow
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  2. Bernard Riedl
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  3. Pierre Blanchet
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Correspondence to Bernard Riedl.

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Sow, C., Riedl, B. & Blanchet, P. UV-waterborne polyurethane-acrylate nanocomposite coatings containing alumina and silica nanoparticles for wood: mechanical, optical, and thermal properties assessment. J Coat Technol Res 8, 211–221 (2011). https://doi.org/10.1007/s11998-010-9298-6

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  • DOI: https://doi.org/10.1007/s11998-010-9298-6

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