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Effects of surface ageing on wettability, surface chemistry, and adhesion of wood

Einfluß der Oberflächenalterung auf die Benetzbarkeit, Oberflächenchemie und Klebeeigenschaften von Holz

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Abstract

The effects of ageing on the surface chemistry, wettability and the surface free energy were determined according to the acid base theory using contact angle measurements and x-ray photoelectron spectroscopy. Time is a significant variable affecting wettability and adhesion. All measured surface parameters of the wood surface were storage time dependent. It could be demonstrated that the effect of ageing on the adhesion of a coating on the wood surface depends not only on the properties of the wood surface, but also on the chemical nature of the coating. Therefore, measurements on wettability without considering the time dependence of surface energy and, above all, its components, are not sufficient to assess effects of ageing on adhesion.

Zusammenfassung

Die Wirkung der Alterung auf die Oberflächenchemie, die Benetzbarkeit und die freie Oberflächenenergie nach der Säure/Base Theorie wurden mittels Kontaktwinkelmessungen und Photoelektronenspektroskopie untersucht. Die Zeit beeinflusste die Benetzbarkeit und Adhäsion des Holzes deutlich. Mit der Lagerungszeit veränderten sich alle gemessenen Parameter der Holzoberfläche. Es konnte gezeigt werden, daß der Alterungseffekt auf die Adhäsion einer Beschichtung nicht nur von den Eigenschaften der Holzoberfläche, sondern auch von der Chemie der Beschichtung abhängt. Benetzungsmessungen ohne Berücksichtigung der freien Oberflächenenergie und ihrer Komponenten reichen daher nicht aus, um Alterungseffekte auf die Adhäsion abzuschätzen.

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Notes

  1. The contact angle is defined as the angle between the tangent to the liquid surface and the liquid/solid surface at the point of liquid/solid contact (see also Gindl et al. 2001a).

  2. ”0–4 h” indicates the mean value of surface free energy (and wettability) on sanded surfaceof spruce immediately after treatment and after 1; 2 and 4 h, as no significant difference between these four measurements was found.

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Acknowledgement

The authors acknowledge financial support of these studies by Hilti AG (Schaan, Principality of Liechtenstein) within the CD-Laboratory.

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Authors and Affiliations

  1. Institute of Physics and Materials Science and Christian-Doppler-Laboratory for Fundamentals of Wood Machining, BOKU—University of Natural Resources and Applied Life Sciences Vienna, Türkenschanzstr. 18, 1180, Vienna, Austria

    M. Gindl, G. Sinn & S. E. Stanzl-Tschegg

  2. Austrian Industrial Research Promotion Fund (FFF), Vienna, Austria

    A. Reiterer

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  1. M. Gindl
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  2. A. Reiterer
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  3. G. Sinn
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  4. S. E. Stanzl-Tschegg
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Correspondence to M. Gindl.

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Gindl, M., Reiterer, A., Sinn, G. et al. Effects of surface ageing on wettability, surface chemistry, and adhesion of wood. Holz Roh Werkst 62, 273–280 (2004). https://doi.org/10.1007/s00107-004-0471-4

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