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Study of adhesive bondlines in modified wood with fluorescence microscopy and X-ray micro-computed tomography
Georg-August-University Göttingen, Germany.
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.ORCID iD: 0000-0002-6909-2025
Georg-August-University Göttingen, Germany.
Georg-August-University Göttingen, Germany.
2016 (English)In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 68, p. 351-358Article in journal (Refereed) Published
Abstract [en]

The quantitative penetration of three coldset wood adhesives [one-component polyurethane (PU), emulsion polymer isocyanate (EPI), poly (vinyl acetate) (PVAc)] under hydraulic pressure into different types of modified wood was studied using fluorescence microscopy and the results were compared to these of a previous study without pressure on adjacent wood samples. The effective penetration (EP) of PU was negatively affected by furfurlylation and NMM modification when pressure was applied. For PVAc, 30% NMM treatment and heat treatment of Scots pine and beech at 210 °C had a negative effect on its EP, but against this the EP of this adhesive increased after heat treatment of beech at 195 °C. In the case of furfurylation, the depth of penetration of all adhesives was less into wood treated with higher concentration of furfuryl alcohol. PU showed a much deeper penetration into NMM-modified and heat-treated wood than the other adhesives with the exception of heat-treated beech at 195 °C. Application of pressure led to rather different results as compared to the EP data when no pressure was applied. The three-dimensional (3D) visualisation of the penetration of PU adhesive into heat-treated Scots pine was also examined by X-ray micro-computed tomography (XµCT). The 3D flow pattern of PU adhesive into heat-treated Scots pine was clearly depicted by XµCT.

Place, publisher, year, edition, pages
2016. Vol. 68, p. 351-358
Keywords [en]
Modified wood, Adhesive penetration, Bondline, Fluorescence microscopy, X-ray tomography
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-52043DOI: 10.1016/j.ijadhadh.2016.04.006ISI: 000378470400040Scopus ID: 2-s2.0-84966365399OAI: oai:DiVA.org:lnu-52043DiVA, id: diva2:918813
Available from: 2016-04-12 Created: 2016-04-12 Last updated: 2017-11-30Bibliographically approved

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Adamopoulos, Stergios

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