FT-IR and UV Raman spectroscopic studies on thermal modification of Scots pine wood and its extractable compounds

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Nuopponen, Mari
dc.date.accessioned 2012-02-17T06:57:32Z
dc.date.available 2012-02-17T06:57:32Z
dc.date.issued 2005-04-29
dc.identifier.isbn 951-22-7606-2
dc.identifier.issn 1457-1382
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2560
dc.description.abstract The aim of this study was to examine, in some detail, the thermally induced changes in Scots pine (Pinus sylvestris) wood with Fourier transform infrared (FT-IR) and UV resonance Raman (UVRR) spectroscopies. These techniques were also utilised to identify lipophilic and hydrophilic extracts from heat-treated and native wood samples. Furthermore, the molecular structures of the extractable compounds characteristic for Scots pine wood were comprehensively studied with UVRR spectroscopy. Spectroscopic data revealed that the structure of thermally treated wood was extensively modified at temperatures above 200 °C. These modifications included the depolymerisation and condensation of lignin, degradation of hemicelluloses as well as the removal and/or decomposition of the wood resin components. UVRR and FT-IR spectral data indicated that thermally modified wood treated at temperatures above 200 °C had increased durability against fungal attack and damage. The structure of lignin on the surface of thermally treated wood was less vulnerable to weathering than that of untreated wood. A diminished content of hemicelluloses contributed, at least partially, to the improved fungal and weather durability of heat-treated wood, as did the lower equilibrium moisture content and swelling. It is likely that the modified structure of lignin in the heat treated wood partially retarded UV light-induced degradation reactions of lignin during natural weathering. All unsaturated model compounds of wood resin were resonance enhanced by UV excitation. Spectra recorded from solid heartwood, knotwood, and branchwood samples included medium to strong Raman signals due to the unsaturated structures of wood resin. Moreover, characteristic bands for particular extractable compounds were observed in the UVRR spectra of the lipophilic and hydrophilic extracts and solid wood samples. Of these, pinosylvin had a useful band in the fingerprint region at 997 cm−1 and was identified as being present sometimes in significant quantities. en
dc.format.extent 40, [51]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Reports / Helsinki University of Technology, Laboratory of Forest Products Chemistry. Series A en
dc.relation.ispartofseries 23 en
dc.relation.haspart Nuopponen, M., Vuorinen, T., Viitaniemi, P., Jämsä, S., Effects of heat treatment on the behaviour of extractives in softwood studied by FTIR spectroscopic methods, Wood Science and Technology, 37 (2003) 109-115.
dc.relation.haspart Nuopponen, M., Vuorinen, T., Jämsä, S., Viitaniemi, P., Chemical modifications in heat-treated softwood studied by FT-IR and UV resonance Raman (UVRR) spectroscopies, Journal of Wood Chemistry and Technology, 24 (2004) 13-26.
dc.relation.haspart Nuopponen, M., Wikberg, H., Vuorinen, T., Maunu, S. L., Jämsä, S., Viitaniemi, P., Heat-treated wood exposed to weathering, Journal of Applied Polymer Science, 91 (2004) 2128-2134.
dc.relation.haspart Wikberg, H., Nuopponen, M., Maunu, S. L., Sundholm, F., Vuorinen, T., 13C CPMAS NMR and FTIR studies of thermally modified wood exposed to brown and soft rot fungi, Applied Spectroscopy, 57 (2003) 266-273.
dc.relation.haspart Nuopponen, M., Willför, S., Jääskeläinen, A.-S., Sundberg, A., Vuorinen, T., A UV resonance Raman (UVRR) spectroscopic study on the extractable compounds in Scots pine (Pinus sylvestris) wood. Part I Lipophilic compounds, Spectrochimica Acta Part A, 60 (2004) 2953-2961.
dc.relation.haspart Nuopponen, M., Willför, S., Jääskeläinen, A.-S., Vuorinen, T., A UV resonance Raman (UVRR) spectroscopic study on the extractable compounds in Scots pine wood (Pinus sylvestris). Part II Hydrophilic compounds, Spectrochimica Acta Part A, 60 (2004) 2963-2968.
dc.subject.other Paper technology en
dc.title FT-IR and UV Raman spectroscopic studies on thermal modification of Scots pine wood and its extractable compounds en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Forest Products Technology en
dc.contributor.department Puunjalostustekniikan osasto fi
dc.subject.keyword softwood en
dc.subject.keyword heat treatment en
dc.subject.keyword FT-IR spectroscopy en
dc.subject.keyword UVRR spectroscopy en
dc.subject.keyword wood resin en
dc.subject.keyword hydrophilic compounds en
dc.identifier.urn urn:nbn:fi:tkk-005148
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en
dc.contributor.lab Laboratory of Forest Products Chemistry en
dc.contributor.lab Puunjalostuksen kemian laboratorio fi


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