Almkvist, Gunnar
- The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences
Abstract
Oak from the Swedish warship Vasa and recent oak that was aged after impregnation with iron(II) chloride has been analyzed by FT-IR spectroscopy and submitted to tensile strength testing. The aim was to investigate correlations between FT-IR bands in the fingerprint region, chemical degradation, and tensile strength in iron contaminated oak. The concentration of carboxylic functions increased and the acetyl groups in the hemicellulose fraction were decreasing as a function of degradation time. These changes are accompanied by reduced tensile strength and elevated content of oxalic acid (OA) in both Vasa wood and the impregnated recent oak samples. To evaluate the possibility to predict tensile strength from spectral data, chemometric modeling by partial least-squares (PLS) regression was applied. The strategy of repeated double cross validation (rdCV) allowed a realistic prediction of tensile strength. Overall, chemical changes and mechanical performances of iron contaminated wood are strongly correlated and thus FT-IR spectroscopy is suited to predict the strength properties of the degraded wood.
Keywords
degradation; FT-IR; iron compounds; oak; PLS; rdCV; tensile strength; Vasa; waterlogged wood
Published in
Holzforschung
2016, volume: 70, number: 9, pages: 855-865
Publisher: WALTER DE GRUYTER GMBH
SLU Authors
Norbakhsh, Shahin
- The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences
- The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences
UKÄ Subject classification
Analytical Chemistry
Materials Chemistry
Wood Science
Publication identifier
- DOI: https://doi.org/10.1515/hf-2015-0223
Permanent link to this page (URI)
https://res.slu.se/id/publ/78243