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Microstructure of chemically modified wood using X-ray computed tomography in relation to wetting properties
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials. SP Tech Res Inst Sweden Chem Mat & Surfaces, Sweden.ORCID iD: 0000-0003-0016-3398
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-9156-3161
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
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2017 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 71, no 2, 119-128 p.Article in journal (Refereed) Published
Abstract [en]

X-ray computed tomography (XCT) was utilized to visualize and quantify the 2D and 3D microstructure of acetylated southern yellow pine (pine) and maple, as well as furfurylated pine samples. The total porosity and the porosity of different cell types, as well as cell wall thickness and maximum opening of tracheid lumens were evaluated. The wetting properties (swelling and capillary uptake) were related to these microstructural characteristics. The data show significant changes in the wood structure for furfurylated pine sapwood samples, including a change in tracheid shape and filling of tracheids by furan polymer. In contrast, no such changes were noted for the acetylated pine samples at the high resolution of 0.8 mu m. The XCT images obtained for the furfurylated maple samples demonstrated that all ray cells and some vessel elements were filled with furan polymer while the fibers largely remained unchanged. Furfurylation significantly decreased the total porosity of both the maple and pine samples. Furthermore, this was observed in both earlywood (EW) and latewood (LW) regions in the pine samples. In contrast, the total porosity of pine samples was hardly affected by acetylation. These findings are in line with wetting results demonstrating that furfurylation reduces both swelling and capillary uptake in contrast to acetylation which reduces mostly swelling. Furfurylation significantly increased the cell wall thickness of both the maple and pine samples, especially at higher levels of furfurylation.

Place, publisher, year, edition, pages
WALTER DE GRUYTER GMBH , 2017. Vol. 71, no 2, 119-128 p.
Keyword [en]
acetylation, cell wall thickness, furfurylation, hardwood, microstructure, porosity, softwood, sub-micron X-ray computed tomography, tracheid, wettability
National Category
Wood Science
Identifiers
URN: urn:nbn:se:kth:diva-204696DOI: 10.1515/hf-2015-0227ISI: 000394124800004ScopusID: 2-s2.0-85011867252OAI: oai:DiVA.org:kth-204696DiVA: diva2:1105108
Funder
EU, FP7, Seventh Framework Programme, 284181Swedish Research Council Formas, 2014-172
Note

QC 20170602

Available from: 2017-06-02 Created: 2017-06-02 Last updated: 2017-06-02Bibliographically approved

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