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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 / Rio, Jose C. / 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 / Laine, Christiane / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Potthast, Antje / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Takano, Toshiyuki / Tamminen, Tarja / Theliander, Hans / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

12 Issues per year


IMPACT FACTOR 2016: 1.868
5-year IMPACT FACTOR: 1.875

CiteScore 2016: 1.83

SCImago Journal Rank (SJR) 2015: 0.817
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1437-434X
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Volume 66, Issue 6 (Aug 2012)

Issues

Determination of adhesive energy at the wood cell-wall/UF interface by nanoindentation (NI)

Michael Obersriebnig
  • Department of Materials Science and Process Technology, BOKU – University of Natural Resources and Life Science, Vienna, Austria
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/ Stefan Veigel
  • Department of Materials Science and Process Technology, BOKU – University of Natural Resources and Life Science, Vienna, Austria
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/ Wolfgang Gindl-Altmutter
  • Corresponding author
  • Department of Materials Science and Process Technology, BOKU – University of Natural Resources and Life Science, Vienna, Austria
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/ Johannes Konnerth
  • Department of Materials Science and Process Technology, BOKU – University of Natural Resources and Life Science, Vienna, Austria
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Published Online: 2012-02-29 | DOI: https://doi.org/10.1515/hf-2011-0205

Abstract

Spruce wood specimens were surface-silylated according to three different protocols in order to progressively reduce hydrophilicity and, consequently, adhesion to urea-formaldehyde (UF) glue. Compared to the untreated reference, the macroscopic adhesive strength was drastically reduced in silylated specimens. Specimens treated with the most effective silylation method in terms of reduction of hydrophilicity showed near zero adhesion to UF glue. Micromechanical characterisation by means of nanoindentation (NI, Berkovich-type probe) revealed that the wood cell wall stiffness and hardness was not significantly affected by silylation. Contrarily, NI experiments (conical indenter tip with 60° opening angle) performed directly at the interface between the wood cell wall and the adhesive showed significantly reduced hardness and reduced specific work of NI in silylated specimens. It is concluded that the measured correlation between reduced hydrophilicity in silylated specimens and the mechanical strength of the interface is due to reduced adhesion. This allows calculating the specific adhesive energy for the system wood cell wall–urea formaldehyde glue from the difference between the specific work of adhesion obtained from the unmodified reference and the most efficiently silylated specimen. The advantage of this new method lies in the position-resolved measurement of qualitative differences in adhesive energy directly at the interface. This is not feasible with macroscopic test methods, which also include effects of surface roughness, cellular adhesive penetration, or grain angle.

Keywords: adhesive bond line; adhesive energy; nanoindentation (NI); urea-formaldehyde (UF); wood glueing

About the article

Corresponding author. Department of Materials Science and Process Technology, BOKU – University of Natural Resources and Life Science Vienna, Konrad Lorenz Strasse 24, A-3430 Tullin, Austria Phone: +43-1-47654-4255 Fax: +43-1-47654-4295


Received: 2011-10-10

Accepted: 2012-01-31

Published Online: 2012-02-29

Published in Print: 2012-08-01


Citation Information: , ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2011-0205.

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©2012 by Walter de Gruyter Berlin Boston. Copyright Clearance Center

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