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Water vapour sorption characteristics and surface chemical composition of thermally modified spruce
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.
Department of Forest Products Technology, Aalto University.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-9156-3161
Department of Forest Products Technology, Aalto University.
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(English)Manuscript (preprint) (Other academic)
Keyword [en]
Thermally modified wood, dynamic vapour sorption (DVS), X-ray photoelectron spectroscopy (XPS), surface chemistry, Norway spruce
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-172985OAI: oai:DiVA.org:kth-172985DiVA: diva2:851335
Funder
Knowledge FoundationSwedish Foundation for Strategic Research
Note

QS 2015

Forskningsfinansiärer:

Stiftelsen Nils och Dorthi Troëdssons forskningsfond (Projektnr 793/12 Hydro-termisk-mekanisk modifiering av trä)

EcoBuild Institute Excellence Centre

COST Action FP0904

Available from: 2015-09-04 Created: 2015-09-04 Last updated: 2015-09-08Bibliographically approved
In thesis
1. Surface characterisation of thermally modified spruce wood and influence of water vapour sorption
Open this publication in new window or tab >>Surface characterisation of thermally modified spruce wood and influence of water vapour sorption
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Today there is growing interest within the construction sector to increase the proportion of biobased building materials made from renewable resources. By-products or residuals from wood processing could in this case be valuable resources for manufacturing new types of biocomposites. An important research question related to wood-based biocomposites is how to characterise molecular interactions between the different components in the composite. The hygroscopic character of wood and its water sorption properties are also crucial. Thermal modification (or heat treatment) of wood results in a number of enhanced properties such as reduced hygroscopicity and improved dimensional stability as well as increased resistance to microbiological decay.

In this thesis, surface characteristics of thermally modified wood components (often called wood fibres or particles) and influencing effects from moisture sorption have been analysed using a number of material characterisation techniques. The aim is to increase the understanding in how to design efficient material combinations for the use of such wood components in biocomposites. The specific objective was to study surface energy characteristics of thermally modified spruce (Picea abies Karst.) under influences of water vapour sorption. An effort was also made to establish a link between surface energy and surface chemical composition. The surface energy of both thermally modified and unmodified wood components were studied at different surface coverages using inverse gas chromatography (IGC), providing information about the heterogeneity of the surface energy. The water vapour sorption behaviour of the wood components was studied using the dynamic vapour sorption (DVS) method, and their surface chemical composition was studied by means of X-ray photoelectron spectroscopy (XPS). Additionally, the morphology of the wood components was studied with scanning electron microscopy (SEM).

The IGC analysis indicated a more heterogeneous surface energy character of the thermally modified wood compared with the unmodified wood. An increase of the dispersive surface energy due to exposure to an increased relative humidity (RH) from 0% to 75% RH at 30 ˚C was also indicated for the modified samples. The DVS analysis indicated an increase in equilibrium moisture content (EMC) in adsorption due to the exposure to 75% RH. Furthermore, the XPS results indicated a decrease of extractable and a relative increase of non-extractable compounds due to the exposure, valid for both the modified and the unmodified wood. The property changes due to the increased RH condition and also due to the thermal modification are suggested to be related to alterations in the amount of accessible hydroxyl groups in the wood surface. Recommendations for future work and implications of the results could be related to knowledge-based tailoring of new compatible and durable material combinations, for example when using thermally modified wood components in new types of biocomposites for outdoor applications.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. xiii, 36 p.
Series
TRITA-BYMA, ISSN 0349-5752 ; 2015:4
Keyword
Thermally modified wood, Norway spruce, inverse gas chromatography (IGC), dynamic vapour sorption (DVS), X-ray photoelectron spectroscopy (XPS), surface energy, Värmebehandlat trä, gran, omvänd gaskromatografi (IGC), dynamic vapour sorption (DVS), röntgenelektronspektroskopi (XPS), ytegenskaper, ytenergi
National Category
Civil Engineering Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-172989 (URN)
Presentation
2015-09-25, B25, Brinellvägen 23, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council Formas, EnWoBio 2014-172
Note

Forskningsfinansiärer och strategiska forskningsprojekt:

Nils och Dorthi Troëdssons forskningsfond (Projektnr 793/12 Hydro-termo-mekanisk modifiering av trä).

 KTH Royal Institute of Technology.

 COST Action FP0904.

 KK-Stiftelsen.

Stiftelsen för strategiskt forskning (SSF). QC 20150908

Available from: 2015-09-08 Created: 2015-09-04 Last updated: 2015-09-08Bibliographically approved

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Wålinder, MagnusSegerholm, Kristoffer

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