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Effect of heat treatment on the wettability of white ash and soft maple by water

Einfluss der Wärmebehandlung auf die Benetzbarkeit von Weißesche und Rot-Ahorn mit Wasser

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Abstract

Heat treatment of wood has attracted a lot of attention both in Europe and recently in North America as an environmentally-friendly wood-protection method. The untreated wood is hydrophilic (high affinity for water). During the heat treatment, wood becomes more and more hydrophobic (low affinity for water) with increasing heat treatment temperature. As a result, it becomes more resistant to biological attacks. Furthermore, it becomes dimensionally more stable compared to untreated wood. Its hardness increases. As the wood becomes more hydrophobic, its wettability by water decreases. The effect of heat treatment is different for each species. Studying the wetting characteristics of heat treated wood gives a good indication of the heat treatment effects on certain wood properties which are related to its degree of hydrophobic character. The aim of this work was to study the characteristics of dynamic wetting process for two different heat-treated North American wood species white ash (Fraxinus americana) and soft maple (Acer rubrum). Contact angle measurements before and after heat treatment showed a significant increase in wood hydrophobicity. Advancing contact angles of a water drop were in all cases higher for heat-treated wood than for untreated wood.

Zusammenfassung

Die Wärmebehandlung von Holz als umweltfreundliche Holzschutzmethode stößt in Europa und seit kurzem auch in Nordamerika auf zunehmendes Interesse. Unbehandeltes Holz ist hydrophil, d.h. es nimmt leicht Wasser auf. Während der Wärmebehandlung wird Holz mit steigender Temperatur zunehmend hydrophob, d.h. Wasser abweisend, und infolgedessen gegenüber einem biologischen Befall resistenter. Auch ist es im Vergleich zu unbehandeltem Holz dimensionsstabiler und die Härte nimmt zu. Da das Holz zunehmend hydrophob wird, nimmt die Benetzbarkeit durch Wasser ab. Der Einfluss einer Wärmebehandlung hängt von der Holzart ab. Die Untersuchung der Benetzungseigenschaften von behandeltem Holz ist ein guter Anhaltspunkt für den Einfluss der Wärmebehandlung auf verschiedene Holzeigenschaften, die vom Grad der Hydrophobie abhängen. Ziel dieser Arbeit ist es, die Wirkung eines dynamischen Benetzungsverfahrens auf die zwei wärmebehandelten nordamerikanischen Holzarten Weißesche (Fraxinus americana) und Rot-Ahorn (Acer rubrum) zu untersuchen. Die Messung der Kontaktwinkel vor und nach der Wärmebehandlung zeigt einen signifikanten Anstieg der Hydrophobie von Holz. Die Kontaktwinkel eines Wassertropfens waren bei behandeltem Holz größer als bei unbehandeltem Holz.

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Authors and Affiliations

  1. Department of Applied Sciences, University of Quebec at Chicoutimi, 555, boul. de l’Université, G7H 2B1, Chicoutimi, Québec, Canada

    Duygu Kocaefe, Sandor Poncsak, Geneviève Doré & Ramdane Younsi

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  1. Duygu Kocaefe
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  2. Sandor Poncsak
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  3. Geneviève Doré
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  4. Ramdane Younsi
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Correspondence to Duygu Kocaefe.

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Kocaefe, D., Poncsak, S., Doré, G. et al. Effect of heat treatment on the wettability of white ash and soft maple by water . Holz Roh Werkst 66, 355–361 (2008). https://doi.org/10.1007/s00107-008-0233-9

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