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Dimensional stabilisation of Scots pine (Pinus sylvestris L.) sapwood by reaction with maleic anhydride and sodium hypophosphite
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0003-4335-8419
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-7711-9267
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering. Department of Wood Processing and Biomaterials, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Kamýcká 129, Suchdol, 165 21, Praha 6, Czech Republic.ORCID iD: 0000-0002-5565-6651
Department of Forestry, Wood Sciences and Design, Laboratory of Wood Science and Technology, University of Thessaly, 43100, Karditsa, Greece.
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2021 (English)In: European Journal of Wood and Wood Products, ISSN 0018-3768, E-ISSN 1436-736X, Vol. 79, no 3, p. 589-596Article in journal (Refereed) Published
Abstract [en]

Wood has the ability to absorb and desorb moisture, which can affect its dimensional size when in use. Limiting this can provide products with greater shape stability and less stresses on external coatings. One method that has been investigated for achieving this has been through chemical modification. In this work, the dimensional stabilisation imparted to Scots pine sapwood by chemical modification with maleic anhydride (MA) combined with sodium hypophosphite (SHP) was investigated. The influence of concentration of MA, treatment temperature and treatment period on weight percent gain (WPG) and bulking coefficient (BC) during treatment with MA and SHP of wood was studied. Furthermore, dimensional stability was determined by the water soak/oven dry method (wet-dry cycle) through five cycles in order to determine the hydrolytic stability of the ester bond and any potential cross-linking reactions. Wood blocks (20 × 20 × 10 mm) modified with MA combined with SHP exhibited lower weight loss following water soaking than unmodified blocks or MA-treated blocks. Wood blocks modified with MA and SHP showed the best anti-swelling efficiency and minimum wet-volume (water-saturated). However, as the concentration of SHP increased, dimensional stability was diminished without any increase in weight percentage gain after water soaking. When combined with FTIR results, it appeared that the modification with MA and SHP seemed to form cross-linking between wood constituents, though high concentration of SHP did not seem to result in additional cross-linking.

Place, publisher, year, edition, pages
Springer, 2021. Vol. 79, no 3, p. 589-596
National Category
Wood Science
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-82413DOI: 10.1007/s00107-020-01650-6ISI: 000604492600006Scopus ID: 2-s2.0-85098672079OAI: oai:DiVA.org:ltu-82413DiVA, id: diva2:1518052
Funder
Vinnova, 2017-02697Swedish Research Council Formas, 2017-00419
Note

Validerad;2021;Nivå 2;2021-05-17 (johcin);

Finansiär: OP RDE (CZ.02.1.01/0.0/0.0/16_019/0000803)

Available from: 2021-01-15 Created: 2021-01-15 Last updated: 2021-10-15Bibliographically approved

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Kim, InjeongKarlsson, OlovJones, DennisSandberg, Dick

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