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    Non-fluorine surface modification of acetylated birch for improved water repellence

    Year: 2021

    Journal: Holzforschung, Volume 75, SEP, page 857–868

    Authors: Yin, Haiyan; Moghaddam, Maziar Sedighi; Tuominen, Mikko; Dedinaite, Andra; Walinder, Magnus; Swerin, Agne

    Organizations: Formas research council [2016-01362]; Vinnova [2017-02712]

    Keywords: acetylated wood; multicycle Wilhelmy plate method; non-fluorine surface modification; silicone nanofilaments; superhydrophobic coating

    In this work, a non-fluorinated surface treatment, i.e., hydrophobized silicone nanofilaments, was applied on both birch and acetylated birch wood samples via a gas-phase based reaction. A superhydrophobic behavior was observed on both the surface-modified samples as revealed by the static water contact angles (CAs) greater than 160 degrees, also valid for samples prepared with the shortest reaction time of 1 h. The dynamic wettability behavior of the samples was studied by a multicycle Wilhelmy plate method. The surface-modified acetylated birch exhibited a pronounced enhanced water resistance, resulting in very low water uptake of 3 +/- 1 wt% after 100 cycles, which was not only about 29 and 5 times lower than that of the non-surface-modified birch and acetylated birch, respectively, but also three times lower than that of the surface-modified birch. Moreover, the aesthetic appearance of the acetylated wood was maintained as the surface modification only resulted in a small color change. This work shows the potential of preparing super water-repellent wood by non-fluorinated surface modification.
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