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Effect of addition of cellulose nanocrystals to wood coatings on color changes and surface roughness due to accelerated weathering


An aqueous ultraviolet-cured polyurethane acrylate transparent resin formulation was submitted for accelerated weathering for 1200 h, on wood substrate, with and without added cellulose nanocrystals (CNC) in coatings. In previous work, addition of CNC improved several mechanical properties of the coating without changing other desirable properties such as optical transparency, color, and gloss. Measurements of nanoroughness were performed with atomic force microscopy on coated weathered surfaces. Surface roughness increased 8–10 times following weathering. Color and lightness measurements were done periodically, each 100 h, during the weathering. Testing was also done for a multilayer coating, varnish on an opaque coating on wood. Addition of unmodified, i.e., hydrophilic, CNC to transparent coatings did not downgrade the color stability of coatings but actually increased their color stability, while the effect on hydrophobically modified CNC was somewhat less. Thus, addition of CNC to coatings not only increases mechanical properties but also increases color stability of coated wood.

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  1. 1.

    Evans, P, Thay, P, Schmalzl, K, “Degradation of Wood Surfaces During Natural Weathering. Effects on Lignin and Cellulose and on the Adhesion of Acrylic Latex Primers.” Wood Sci. Technol., 30 (6) 411–422 (1996)

    Article  Google Scholar 

  2. 2.

    George, B, Suttie, E, Merlin, A, Deglise, X, “Photodegradation and Photostabilisation of Wood—The State of the Art.” Polym. Degrad. Stab., 88 (2) 268–274 (2005)

    Article  Google Scholar 

  3. 3.

    Martin, A, “Intrinsic Viscosity of Cellulose.” Ind. Eng. Chem., 45 (11) 2497–2499 (1953)

    Article  Google Scholar 

  4. 4.

    Tolvaj, L, Faix, O, “Artificial Ageing of Wood Monitored by DRIFT Spectroscopy and CIE L* a* b* Color Measurements. 1. Effect of UV Light.” Int. J. Biol. Chem. Phys. Technol. Wood, 49 (5) 397–404 (1995)

    Google Scholar 

  5. 5.

    Teacă, C-A, Roşu, D, Bodîrlău, R, Roşu, L, “Structural Changes in Wood under Artificial UV Light Irradiation Determined by FTIR Spectroscopy and Color Measurements–A Brief Review.” BioResources, 8 (1) 1478–1507 (2013)

    Google Scholar 

  6. 6.

    Auclair, N, Stabilité des couleurs des systèmes bois/vernis améliorée par des revêtements nanocomposites aqueux à usage extérieur. Université Laval, Québec, 2010

    Google Scholar 

  7. 7.

    Singh, R, Tomer, NS, Bhadraiah, SV, “Photo-oxidation Studies on Polyurethane Coating: Effect of Additives on Yellowing of Polyurethane.” Polym. Degrad. Stab., 73 (3) 443–446 (2001)

    Article  Google Scholar 

  8. 8.

    Chang, S-T, Chou, P-L, “Photo-discoloration of UV-Curable Acrylic Coatings and the Underlying Wood.” Polym. Degrad. Stab., 63 (3) 435–439 (1999)

    Article  Google Scholar 

  9. 9.

    Irmouli, Y, George, B, Merlin, A, “Artificial Ageing of Wood Finishes Monitored by IR Analysis and Color Measurements.” J. Appl. Polym. Sci., 124 (3) 1938–1946 (2012)

    Article  Google Scholar 

  10. 10.

    Evans, P, Matsunaga, H, Kiguchi, M, “Large-Scale Application of Nanotechnology for Wood Protection.” Nat. Nanotechnol., 3 (10) 577 (2008)

    Article  Google Scholar 

  11. 11.

    Auclair, N, Riedl, B, Blanchard, V, Blanchet, P, “Improvement of Photoprotection of Wood Coatings by Using Inorganic Nanoparticles as Ultraviolet Absorbers.” For. Prod. J., 61 (1) 20–27 (2011)

    Google Scholar 

  12. 12.

    Landry, V, Blanchet, P, Riedl, B, “Mechanical and Optical Properties of Clay-Based Nanocomposites Coatings for Wood Flooring.” Prog. Org. Coat., 67 (4) 381–388 (2010)

    Article  Google Scholar 

  13. 13.

    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 (2) 211–221 (2011)

    Article  Google Scholar 

  14. 14.

    Vlad Cristea, M, Riedl, B, Blanchet, P, “Enhancing the Performance of Exterior Waterborne Coatings for Wood by Inorganic Nanosized UV Absorbers.” Prog. Org. Coat., 69 (4) 432–441 (2010)

    Article  Google Scholar 

  15. 15.

    Poaty, B, Vardanyan, V, Wilczak, L, Chauve, G, Riedl, B, “Modification of Cellulose Nanocrystals as Reinforcement Derivatives for Wood Coatings.” Prog. Org. Coat., 77 (4) 813–820 (2014)

    Article  Google Scholar 

  16. 16.

    Revol, JF, Bradford, H, Giasson, J, Marchessault, RH, Gray, DG, “Helicoidal Self-ordering of Cellulose Microfibrils in Aqueous Suspension.” Int. J. Biol. Macromol., 14 (3) 170–172 (1992)

    Article  Google Scholar 

  17. 17.

    Helbert, W, Cavaille, JY, Dufresne, A, “Thermoplastic Nanocomposites Filled with Wheat Straw Cellulose Whiskers. 1. Processing and Mechanical Behavior.” Polym. Compos., 17 (4) 604–611 (1996)

    Article  Google Scholar 

  18. 18.

    Vardanyan, V, Poaty, B, Chauve, G, Landry, V, Galstian, T, Riedl, B, “Mechanical Properties of UV-Waterborne Varnishes Reinforced by Cellulose Nanocrystals.” J. Coat. Technol. Res., 11 (6) 841–852 (2014)

  19. 19.

    Vardanyan, V, Poaty, B, Chauve, G, Landry, V, Galstian, T, Riedl, B, “Wear Resistance of UV-Curable of Wood Water-Based Coatings with Added Cellulose Nanocrystals.” In: Anti-abrasive Nanocoatings: Current and Future Applications (2014)

  20. 20.

    Beckmann, P, Spizzichino, A, The Scattering of Electromagnetic Waves from Rough Surfaces, Vol. 511, p. 1. Artech House, Inc., Norwood, MA, 1987

    Google Scholar 

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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 and Dr. Gregory Chauve for the production of CNC.

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Correspondence to Bernard Riedl.

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Vardanyan, V., Galstian, T. & Riedl, B. Effect of addition of cellulose nanocrystals to wood coatings on color changes and surface roughness due to accelerated weathering. J Coat Technol Res 12, 247–258 (2015).

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  • Cellulose nanocrystals
  • CNC
  • UV-water-based coatings
  • Wood
  • Weathering
  • Color stability