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

Konnerth, J., Eiser, M., Jäger, A., Bader, T.K., Hofstetter, K., Follrich, J., Ters, T., Hansmann, C. and Wimmer, R. (2010) Macro- and micro-mechanical properties of red oak wood (Quercus rubra L.) treated with hemicellulases. Holzforschung, 64(4), pp. 447-453. (doi:10.1515/hf.2010.056)

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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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:De Borst, Dr Karin
Authors: Konnerth, J., Eiser, M., Jäger, A., Bader, T.K., Hofstetter, K., Follrich, J., Ters, T., Hansmann, C., and Wimmer, R.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Holzforschung
Publisher:Walter de Gruyter
ISSN:0018-3830
ISSN (Online):1437-434X
Published Online:27 February 2010

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