Abstract
The protection of wood surfaces against water is a primary requirement to enhance their life-time and durability. In this article, a hydrophobic surface modification of selected hardwood surfaces (including high-density (HD) and low-density (LD) samples) is presented, by coating them with waterborne imidized nanoparticles under pure conditions or with vegetable oil. The performance of both nanoparticle coatings relative to noncoated and oil-coated samples was evaluated by water contact angles, microscopy, and optical profilometry. The pure nanoparticle coatings often increase the hydrophobicity, but they do not yet form a fully protective layer due to their porous structure after drying. The nanoparticle coatings with vegetable oil form a continuous layer with a maximum contact angle of 118°. The coating formation highly depends on the wood density (and resulting surface porosity), resulting in spreading of the aqueous dispersion on HD wood and penetration on LD wood. A thin continuous nanoparticle coating with incorporated vegetable oil provides highest contact angles, as the roughness of the original wood fibers remains visible in the surface profile.
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Acknowledgments
P. Samyn acknowledges the Robert Bosch Foundation for support as Juniorprofessor in Sustainable Use of Natural Materials (“Foresnab-project” 2011–2016). A. Paredes would like to thank the Wissenschaftliche Gesellschaft Freiburg for their assistance to transport the wood samples to Germany. We thank J. Van Erps at Vrije Universiteit Brussel (Belgium) for assistance with surface roughness measurements.
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Samyn, P., Stanssens, D., Paredes, A. et al. Performance of organic nanoparticle coatings for hydrophobization of hardwood surfaces. J Coat Technol Res 11, 461–471 (2014). https://doi.org/10.1007/s11998-014-9576-9
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DOI: https://doi.org/10.1007/s11998-014-9576-9