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Wood Research and Technology

Holzforschung

Cellulose – Hemicelluloses – Lignin – Wood Extractives

Editor-in-Chief: Faix, Oskar / Salmén, Lennart

Editorial Board: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / 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

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1437-434X
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Volume 64, Issue 4

Issues

Macro- and micro-mechanical properties of red oak wood (Quercus rubra L.) treated with hemicellulases

Johannes Konnerth
  • Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria
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/ Martina Eiser / Andreas Jäger
  • Institute for Mechanics of Materials and Structures, Faculty of Civil Engineering, Vienna University of Technology, Vienna, Austria
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/ Thomas Karl Bader
  • Institute for Mechanics of Materials and Structures, Faculty of Civil Engineering, Vienna University of Technology, Vienna, Austria
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/ Karin Hofstetter
  • Institute for Mechanics of Materials and Structures, Faculty of Civil Engineering, Vienna University of Technology, Vienna, Austria
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/ Jürgen Follrich / Thomas Ters
  • Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria
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/ Christian Hansmann / Rupert Wimmer
  • Georg-August-University Göttingen, Faculty of Forest Sciences and Forest Ecology, Wood Technology and Wood-based Composites Unit, Göttingen, Germany
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Published Online: 2010-02-26 | DOI: https://doi.org/10.1515/hf.2010.056

Abstract

Red oak wood (Quercus rubra L.) samples were submitted to an enzymatic treatment with a commercial mixture of hemicellulases aiming at the selective depolymerization and removal of the hemicelluloses. Mechanical properties of treated samples were characterized and compared with untreated samples at two hierarchical levels. At the macrolevel, tensile properties revealed to be less sensitive to degradation of the cell wall matrix compared to compression and hardness properties. Results obtained through indentation at the microlevel indicated that hardness and the so-called reduced modulus of treated wood were significantly lowered. Accordingly, hardness and reduced elastic modulus have proven to be most sensitive to modification of the cell wall matrix by reducing the content of hemicelluloses. It is proposed that transversal and shear stresses, which are mainly carried by the cell wall matrix, are additional parameters having strong effects on elastic modulus obtained by nanoindentation. Micromechanical modeling was employed to confirm the observed changes. There is consistency between the measured and the modeled properties, obtained at both the microlevel and the macrolevel of wood.

Keywords: continuum micromechanics model; enzyme; hemicellulose; mechanical properties; modification; nano-indentation; red oak; stiffness; strength

About the article

Corresponding author. Institute of Wood Science and Technology, Department of Material Sciences and Process Engineering, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria


Received: 2009-10-08

Accepted: 2010-01-15

Published Online: 2010-02-26

Published Online: 2010-02-26

Published in Print: 2010-06-01


Citation Information: Holzforschung, Volume 64, Issue 4, Pages 447–453, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf.2010.056.

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