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Rio, Jose C. / Laine, Christiane / Potthast, Antje / Takano, Toshiyuki / Theliander, Hans

Holzforschung

International Journal of the Biology, Chemistry, Physics, and Technology of Wood

Editor-in-Chief: Faix, Oskar

Editorial Board Member: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Salmen, Lennart / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Burgert, Ingo / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Koch, Gerald / Lachenal, Dominique / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Tamminen, Tarja / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

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In This Section
Volume 53, Issue 5 (Sep 1999)

Issues

Sorption Behaviour and Dimensional Changes of Wood-Coating Composites

Mari de Meijer / Holger Militz
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/HF.1999.091

Summary

The moisture related properties of wood-coating composites have been studied to evaluate the influence of coating penetration on the protection of wood against moisture. Pine sapwood samples were vacuum-impregnated with 7 pigmented and unpigmented coatings, both water and solvent borne. The retention and void filling of the coating have been determined. After drying, the samples were exposed to relative humidities between 33 and 98 % and to liquid water and equilibrium moisture content and dimensional changes were measured. The rate of swelling and moisture sorption has been measured, the latter was also used to calculate diffusion coefficients. The sorption isotherms were analysed by the Hailwood-Horrobin equation. In order to obtain additional information on the hygroscopicity of coatings, similar measurement were made on free coating films.

The void filling of wood with coating material has the strongest impact on the uptake of liquid water. A limited reduction was observed for the equilibrium moisture content, the diffusion coefficient during adsorption and the rate of dimensional change. No influence on the equilibrium swelling have been found but the shrinkage during desorption was however often slightly increased for the wood-coating composites.

The limited impact of the penetrated coating on moisture related properties can to a large extent be explained by the low void filling after drying (20–60%) and the relatively high moisture sorption and swelling of the coating film itself. In general, it can be concluded that the moisture protection of penetrated coating material is low in comparison to coating applied as a film on the surface of wood.

About the article

Published Online: 2005-06-01

Published in Print: 1999-09-10



Citation Information: Holzforschung, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/HF.1999.091. Export Citation

Citing Articles

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[1]
Mari de Meijer and Johan Nienhuis
Progress in Organic Coatings, 2009, Volume 65, Number 4, Page 498
[2]
P.A. van Meel, S.J.F. Erich, H.P. Huinink, K. Kopinga, J. de Jong, and O.C.G. Adan
Progress in Organic Coatings, 2011, Volume 72, Number 4, Page 686
[3]
Maria Fredriksson, Lars Wadsö, and Thomas Ulvcrona
Wood Material Science and Engineering, 2010, Volume 5, Number 3-4, Page 135
[4]
M. de Meijer
Surface Coatings International Part B: Coatings Transactions, 2002, Volume 85, Number 2, Page 131

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