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Mechanical properties of UV-waterborne varnishes reinforced by cellulose nanocrystals

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Abstract

There are many instances in the literature of nanocellulose-thermoplastic composites, but there are few studies on coatings reinforced by cellulose nanocrystals (CNCs). The overall objective of this research was to develop organic nanoparticles-reinforced UV-water-based coatings for wood applications and to study the effect, mainly on wear properties, of the final composite coatings. CNC was mixed in the varnishes to improve the mechanical properties of the coatings. One of the key aspects in the technology of nanocomposites remains the dispersion of the nanoparticles within the matrix as well as its affinity with the matrix. To quantify the dispersion, efficient methods of characterization are needed in order to reveal the nanosized particles. In this article, a novel characterization method based on atomic force microscopy was employed to characterize such nanocomposite coatings, by measuring surface nanoroughness, which is clearly correlated with quality of dispersion and mechanical properties. CNC was modified by either alkyl quaternary ammonium bromides or acryloyl chloride. The mechanical properties (abrasion and scratch resistances, hardness and adhesion) were analyzed and compared to the reference varnish without nanoparticles. The modified CNC addition in UV-water-based coatings results in an approximately 30–40% increase in wear resistance (abrasion and scratch), without any loss of appearance.

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Acknowledgments

Thanks to the Fonds de Recherche Nature et Technologie du Québec, the Conseil de Recherches en Sciences Naturelles et Génie du Canada, and Arboranano for funding this research as well as FPInnovations’ pilot plant for the production of CNC.

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Authors and Affiliations

  1. Center for Optics, Photonics and Laser, Department of Physics, Engineering Physics and Optics, Université Laval, 2375 Rue de la Terrasse, Québec, QC, G1V 0A6, Canada

    Vahe Vardanyan & Tigran Galstian

  2. Département des sciences du bois et de la forêt, Faculté de foresterie, de géographie et de géomatique, Université Laval, 2425, rue de la Terrasse, Québec, QC, G1V 0A6, Canada

    Vahe Vardanyan & Bernard Riedl

  3. Centre technologique des résidus industriels, 425, boul. du Collège, Rouyn-Noranda, QC, J9X 5E5, Canada

    Bouddah Poaty

  4. FPInnovations, 570 Bld Saint Jean, Pointe-Claire, QC, H9R 3J9, Canada

    Grégory Chauve

  5. FPInnovations, 319 rue Franquet, Québec, QC, G1P 4R4, Canada

    Véronic Landry

Authors
  1. Vahe Vardanyan
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  2. Bouddah Poaty
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  3. Grégory Chauve
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  4. Véronic Landry
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  5. Tigran Galstian
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  6. Bernard Riedl
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Correspondence to Bernard Riedl.

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Vardanyan, V., Poaty, B., Chauve, G. et al. Mechanical properties of UV-waterborne varnishes reinforced by cellulose nanocrystals. J Coat Technol Res 11, 841–852 (2014). https://doi.org/10.1007/s11998-014-9598-3

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  • DOI: https://doi.org/10.1007/s11998-014-9598-3

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