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Wettability of welded wood-joints investigated by the Wilhelmy method: part 2. Effect of wollastonite additive
Holzforschung  (IF2.393),  Pub Date : 2021-01-26, DOI: 10.1515/hf-2019-0310
Mojgan Vaziri, Olov Karlsson, Lars Abrahamsson, Maziar Sedighi Moghaddam, Dick Sandberg

Abstract 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.