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Cellulose nanocrystal (CNC)-based nanocomposites for UV curable high-solid coating systems

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Abstract

Demand for durable clear wood coatings is on the rise. Cellulose nanocrystals (CNC) constitute an organic nanomaterial widely studied in polymer composites for its reinforcing effect. In this study, CNC was used to enhance the performance of a UV curable high-solid content coating system intended for indoor environments. The CNC surface was modified by a cationic surfactant since the coating system was hydrophobic resin-based requiring hydrophobic nanomaterial reinforcement. Modified CNC was mixed with the coating system using a high-speed mixer and the ultrasonication technique. Mechanical, thermal and morphological properties and curing behavior of the newly developed UV-curing coatings were assessed. Inclusion of CNC in the coating increased the mechanical properties (hardness and reduced modulus) of the coating system to a large extent. Thermal stability of the coating system was also improved by CNC addition. The CNC did not affect the curing behavior of the coating, in contrast to most inorganic nanomaterials. The CNC dispersed well in the matrix at 1% loading. Results of this study show that CNC can be used successfully with high-solid content coating systems.

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Acknowledgments

The authors would like to express their thanks to Forest Products Laboratory – USDA Forest Service for so kindly providing cellulose nanocrystal (CNC) for this research. Thanks are also extended to Research Center for Advanced Materials of Laval University for providing the equipment for the characterizations. This study was funded by Natural Sciences and Engineering Research Council of Canada.

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Authors and Affiliations

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

    Alireza Kaboorani, Nicolas Auclair & Bernard Riedl

  2. Center for Renewable Carbon, University of Tennessee, 2506 Jacob Drive, Knoxville, TN, 37996-4570, USA

    Omid Hosseinaei & Siqun Wang

Authors
  1. Alireza Kaboorani
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  2. Nicolas Auclair
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  3. Bernard Riedl
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  4. Omid Hosseinaei
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  5. Siqun Wang
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Correspondence to Alireza Kaboorani.

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Kaboorani, A., Auclair, N., Riedl, B. et al. Cellulose nanocrystal (CNC)-based nanocomposites for UV curable high-solid coating systems. J Coat Technol Res 14, 1137–1145 (2017). https://doi.org/10.1007/s11998-017-9929-2

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  • DOI: https://doi.org/10.1007/s11998-017-9929-2

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