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

Konnerth, JohannesBOKU-University of Natural Resources and Applied Life Sciences, Austria (författare)

4
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.

Eiser, MartinaCompetence Center for Wood Composites and Wood Chemistry, Austria (författare)
Jäger, AndreasVienna University of Technology, Austria (författare)
Bader, Thomas K.Vienna University of Technology, Austria(Swepub:lnu)thbaaa (författare)
Hofstetter, Karin (författare)
Follrich, JürgenCompetence Center for Wood Composites and Wood Chemistry, Austria (författare)
Ters, ThomasBOKU-University of Natural Resources and Applied Life Sciences, Austria (författare)
Hansmann, ChristianCompetence Center for Wood Composites and Wood Chemistry, Austria (författare)
Wimmer, Rupertood Technology and Wood-based Composites Unit, Germany (författare)
BOKU-University of Natural Resources and Applied Life Sciences, AustriaCompetence Center for Wood Composites and Wood Chemistry, Austria (creator_code:org_t)

Av författaren/redakt...: Konnerth, Johann ...; Eiser, Martina; Jäger, Andreas; Bader, Thomas K.; Hofstetter, Kari ...; Follrich, Jürgen; visa fler...; Ters, Thomas; Hansmann, Christ ...; Wimmer, Rupert; visa färre...

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