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Wettability and surface interactions of natural and thermally modified beech wood with water and water-based coatings: the effect of surface pre-treatment type
University of Ljubljana, Slovenia.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0002-2614-1245
KTH Royal Institute of Technology, Sweden.
2023 (English)In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 81, p. 73-Article in journal (Refereed) Published
Abstract [en]

Proper surface pre-treatment plays an important role for good compatibility between the wood and the coating. The present study aimed to determine the correlations between the type of surface pre-treatment and the wettability for unmodified and thermally modified beech (Fagus sylvatica L.) wood with water and water-based coatings. A new approach to evaluate the water permeability of coating systems was developed by investigating the wettability of wood samples using the multicycle Wilhelmy plate method in combination with immersion of the coated samples in water. The treatment with non-thermal plasma made the wood surfaces more hydrophilic and treatment with organic solvent made the surfaces more hydrophobic. The poorer wettability and sorption with water and coatings in thermally modified wood was clearly related to the altered chemical composition of wood. As the water content in coating increased, the amount of absorbed coating in the wood decreased. The surface pre-treatments had no effect on the colour of the coated wood. The higher water content in the coating negatively affected the water protection performance of the coated wood. The thinner coating films correlated with greater water absorption in the coated wood, generally resulting in microscopic delamination between the wood substrate and the coating films. © 2022, The Author(s)

Place, publisher, year, edition, pages
Springer Science and Business Media Deutschland GmbH , 2023. Vol. 81, p. 73-
Keywords [en]
Coatings, Surface treatment, Water absorption, Water treatment, Wetting, Beech (Fagus sylvatica L.), Beech wood, Coating system, Good compatibility, New approaches, Surface interactions, Surface pre-treatments, Water permeability, Water-based coating, Wood samples, Wood
National Category
Ecology
Identifiers
URN: urn:nbn:se:ri:diva-60156DOI: 10.1007/s00107-022-01875-7Scopus ID: 2-s2.0-85137464656OAI: oai:DiVA.org:ri-60156DiVA, id: diva2:1699936
Note

Funding details: Javna Agencija za Raziskovalno Dejavnost RS, ARRS, P4-0015, P4-0430; Funding text 1: The authors acknowledge the financial support from the Slovenian Research Agency (research programs funding No. P4-0015, ‘‘Wood and lignocellulose composites’’ and No. P4-0430, “Forest-wood value chain and climate change: transition to circular bioeconomy”). The help of Dr. Janez Kovač from Josef Stefan Institute, Ljubljana, Slovenia, for his help with the XPS analysis is gratefully acknowledged. The corresponding author acknowledges Haiyan Yin from RISE Research Institutes of Sweden for her valuable assistance in interpreting the wettability data.

Available from: 2022-09-29 Created: 2022-09-29 Last updated: 2023-07-06Bibliographically approved

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Sedighi Moghaddam, Maziar

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