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    Wettability of welded wood-joints investigated by the Wilhelmy method: part 2. Effect of wollastonite additive

    Year: 2021

    Journal: Holzforschung, Volume 75, JAN, page 79

    Authors: Vaziri, Mojgan; Karlsson, Olov; Abrahamsson, Lars; Moghaddam, Maziar Sedighi; Sandberg, Dick

    Organizations: Swedish Research Council for Environment, Agricultural Sciences and Spatial Planning (FORMAS), project Wood Welding Glue-free Wood Assembly [2017-01157]

    Keywords: apparent contact angle (CA); gas chromatography/mass spectrometry (GC/MS); high-performance liquid chromatography (HPLC); liquid sorption; pine; swelling; welding time

    The effect of wollastonite on the wetting properties of welded Scots pine-joints was studied using the multicycle Wilhelmy plate method and by observation of the chemical composition of the welded joints. Welding pine with wollastonite for 5 s resulted in a decrease in the water uptake and the swelling, and an increase in the contact angle of the welded joint compared to welded wood without wollastonite. High-performance liquid chromatography and gas chromatography/mass spectrometry showed the presence of dehydration products such as furfural, 5-hydroxymethylfurfural, and levoglucosan in methanol extracts from welded joints of specimens welded with and without wollastonite. Phenols were also found by analysis using the Folin-Ciocalteu method and High-performance liquid chromatography. The importance of such compounds in relation to the wetting properties of the welded joint is discussed.
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