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Influence of moisture content on the contact angle and surface tension measured on birch wood surfaces
European Journal of Wood and Wood Products ( IF 2.6 ) Pub Date : 2021-03-12 , DOI: 10.1007/s00107-021-01666-6
Rami Benkreif , Fatima Zohra Brahmia , Csilla Csiha

Surface tension of solid wood surfaces affects the wettability and thus the adhesion of various adhesives and wood coatings. By measuring the contact angle of the wood, the surface tension can be calculated based on the Young-Dupré equation. Several publications have reported on contact angle measured with different test liquids, under different conditions. Results can only be compared if the test conditions are similar. While the roles of the drop volume, image shooting time etc., are widely recognized, the role of the wood surface moisture content (MC) is not evaluated in detail. In this study, the effect of wood moisture content on contact angle values, measured with distilled water and diiodomethane, on sanded birch (Betula pendula) surfaces was investigated, in order to find the relationship between them. With increasing MC from approximately 6% to 30%, increasing contact angle (decreasing surface tension) values were measured according to a logarithmic function. The function makes possible the calculation of contact angles that correspond to different MCs.



中文翻译:

水分含量对桦木表面测量的接触角和表面张力的影响

实木表面的表面张力会影响润湿性,从而影响各种粘合剂和木器涂料的附着力。通过测量木材的接触角,可以基于Young-Dupré方程计算表面张力。一些出版物报道了在不同条件下用不同测试液体测量的接触角。如果测试条件相似,则只能比较结果。尽管已广泛认识到液滴体积,图像拍摄时间等的作用,但未详细评估木材表面含水量(MC)的作用。在这项研究中,木材水分含量对砂磨桦木(桦木(Betula pendula)的蒸馏水和二碘甲烷测量的接触角值的影响))表面进行了研究,以找到它们之间的关系。随着MC从大约6%增加到30%,根据对数函数测量了增大的接触角(减小的表面张力)值。该功能使计算对应于不同MC的接触角成为可能。

更新日期:2021-03-12
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