Almkvist, Gunnar
- Institutionen för kemi och bioteknologi, Sveriges lantbruksuniversitet
Sammanfattning
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.
Nyckelord
degradation; FT-IR; iron compounds; oak; PLS; rdCV; tensile strength; Vasa; waterlogged wood
Publicerad i
Holzforschung
2016, volym: 70, nummer: 9, sidor: 855-865
Utgivare: WALTER DE GRUYTER GMBH
SLU författare
Norbakhsh, Shahin
- Institutionen för kemi och bioteknologi, Sveriges lantbruksuniversitet
- Institutionen för kemi och bioteknologi, Sveriges lantbruksuniversitet
UKÄ forskningsämne
Analytisk kemi
Materialkemi
Trävetenskap
Publikationens identifierare
- DOI: https://doi.org/10.1515/hf-2015-0223
Permanent länk till denna sida (URI)
https://res.slu.se/id/publ/78243