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Article

Hybrid Approach for Wood Modification: Characterization and Evaluation of Weathering Resistance of Coatings on Acetylated Wood

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InnoRenew CoE, Livade 6, 6310 Izola, Slovenia
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Faculty of Mathematics, Natural Sciences and Information Technologies, University of Primorska, Glagoljaška 8, 6000 Koper, Slovenia
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Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O. Box 16300, 00076 Aalto, Finland
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Department of Chemical and Environmental Engineering, University of the Basque Country, Plaza Europa, 1, 20018 Donostia-San Sebastian, Spain
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Andrej Marušič Institute, University of Primorska, Titov trg 4, 6000 Koper, Slovenia
*
Author to whom correspondence should be addressed.
Academic Editor: Salim Hiziroglu
Coatings 2021, 11(6), 658; https://doi.org/10.3390/coatings11060658
Received: 15 May 2021 / Revised: 25 May 2021 / Accepted: 28 May 2021 / Published: 30 May 2021
(This article belongs to the Special Issue Wood Modification: Characterization, Modelling and Applications)
Wood, as a biological material, is sensitive to environmental conditions and microorganisms; therefore, wood products require protective measures to extend their service life in outdoor applications. Several modification processes are available for the improvement of wood properties, including commercially available solutions. Among the chemical treatments, acetylation by acetic anhydride is one of the most effective methods to induce chemical changes in the constitutive polymers at the cellular wall level. Acetylation reduces wood shrinkage-swelling, increases its durability against biotic agents, improves UV resistance and reduces surface erosion. However, even if the expected service life for external cladding of acetylated wood is estimated to be 60 years, the aesthetics change rapidly during the first years of exposure. Hybrid, or fusion, modification includes processes where the positive effect of a single treatment can be multiplied by merging with additional follow-up modifications. This report presents results of the performance tests of wood samples that, besides the modification by means of acetylation, were additionally protected with seven commercially available coatings. Natural weathering was conducted in Northern Italy for 15 months. Samples were characterized with numerous instruments by measuring samples collected from the stand every three months. Superior performance was observed on samples that merged both treatments. It is due to the combined effect of the wood acetylation and surface coating. Limited shrinkage/swelling of the bulk substrate due to chemical treatment substantially reduced stresses of the coating film. Hybrid process, compared to sole acetylation of wood, assured superior visual performance of the wood surface by preserving its original appearance. View Full-Text
Keywords: wood modification; natural weathering; acetylation; coatings; service life performance; aesthetic wood modification; natural weathering; acetylation; coatings; service life performance; aesthetic
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MDPI and ACS Style

Sandak, A.; Földvári-Nagy, E.; Poohphajai, F.; Diaz, R.H.; Gordobil, O.; Sajinčič, N.; Ponnuchamy, V.; Sandak, J. Hybrid Approach for Wood Modification: Characterization and Evaluation of Weathering Resistance of Coatings on Acetylated Wood. Coatings 2021, 11, 658. https://doi.org/10.3390/coatings11060658

AMA Style

Sandak A, Földvári-Nagy E, Poohphajai F, Diaz RH, Gordobil O, Sajinčič N, Ponnuchamy V, Sandak J. Hybrid Approach for Wood Modification: Characterization and Evaluation of Weathering Resistance of Coatings on Acetylated Wood. Coatings. 2021; 11(6):658. https://doi.org/10.3390/coatings11060658

Chicago/Turabian Style

Sandak, Anna, Edit Földvári-Nagy, Faksawat Poohphajai, Rene Herrera Diaz, Oihana Gordobil, Nežka Sajinčič, Veerapandian Ponnuchamy, and Jakub Sandak. 2021. "Hybrid Approach for Wood Modification: Characterization and Evaluation of Weathering Resistance of Coatings on Acetylated Wood" Coatings 11, no. 6: 658. https://doi.org/10.3390/coatings11060658

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