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Liquid sorption, swelling and surface energy properties of unmodified and thermally modified Scots pine heartwood after extraction
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden (2017-2019), Biovetenskap och material, Kemi och material.ORCID-id: 0000-0002-2614-1245
KTH Royal Institute of Technology, Sweden.
2018 (Engelska)Ingår i: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 72, nr 3Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The effect of extractives removal on liquid sorption, swelling and surface energy properties of unmodified wood (UW) and thermally modified Scots pine heartwood (hW) (TMW) was studied. The extraction was performed by a Soxtec procedure with a series of solvents and the results were observed by the multicycle Wilhelmy plate method, inverse gas chromatography (IGC) and Fourier transform infrared (FTIR) spectroscopy. A significantly lower rate of water uptake was found for the extracted UW, compared with the unextracted one. This is due to a contamination effect in the latter case from water-soluble extractives increasing the capillary flow into the wood voids, proven by the decreased water surface tension. The swelling in water increased after extraction 1.7 and 3 times in the cases of UW and TMW, respectively. The dispersive part of the surface energy was lower for the extracted TMW compared to the other sample groups, indicating an almost complete removal of the extractives. The FTIR spectra of the extracts showed the presence of phenolic compounds but also resin acids and aliphatic compounds.

Ort, förlag, år, upplaga, sidor
2018. Vol. 72, nr 3
Nyckelord [en]
extractives, FTIR, inverse gas chromatography (IGC), liquid sorption, multicycle Wilhelmy plate method, Scots pine, surface energy, swelling, thermally modified wood, Binary alloys, Chromatography, Forestry, Fourier series, Fourier transform infrared spectroscopy, Gas chromatography, Interfacial energy, Inverse problems, Liquid chromatography, Liquids, Sorption, Wood products, Inverse gas chromatography, Wilhelmy plate, Extraction
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Naturvetenskap
Identifikatorer
URN: urn:nbn:se:ri:diva-33160DOI: 10.1515/hf-2017-0064Scopus ID: 2-s2.0-85037846034OAI: oai:DiVA.org:ri-33160DiVA, id: diva2:1177987
Tillgänglig från: 2018-01-26 Skapad: 2018-01-26 Senast uppdaterad: 2023-04-04Bibliografiskt granskad

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Sedighi Moghaddam, Maziar

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