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Plasma treatment at atmospheric pressure using a dielectric barrier discharge was carried out to increase the surface hydrophilicity of wood and wood-based materials. Surface energy determination by contact angle measurement revealed an increase in the polar component of surface energy and in total surface energy following plasma treatment. X-ray photoelectron spectroscopy revealed the generation of polar groups and consequently an increase in O/C ratio. The feasibility of plasma polymerization on wooden substrates at atmospheric pressure to create water-repellent characteristics was also investigated. An atmospheric-pressure plasma jet using hexamethyldisiloxane as precursor and air as process gas was used for thin-layer deposition. Treatment parameters for the layer deposition were investigated, as well as the layer topography and chemical composition. Atomic force microscopy revealed a closed surface layer consisting of silicon, oxygen, carbon and hydrogen that exhibited low water permeability.

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In dieser Arbeit wird der Effekt eines Plasmas unter Atmosphärendruck nach dem Prinzip der dielektrisch behinderten Entladung auf die Benetzungs- und Absorptionscharakteristik von thermisch behandelten Buchenholzfurnieren untersucht. Ein einfacher Immersionstest unter Verwendung von Wasser und Melaminlösung wurde ausgeführt und zeigte eine verbesserte Benetzung und Flüssigkeitsaufnahme nach einer Plasmabehandlung. Die Bestimmung des WPG (weight percent gain) bestätigte einen erhöhten Melamingehalt nach einer Plasmabehandlung

In this study, the influence of a dielectric barrier discharge (DBD) at atmospheric pressure on wood plastic composites (WPC), particle board and fibre boards is investigated by means of contact angle measurements. The water contact angle (WCA) is determined and offers a possibility to detect changes of surface properties by plasma treatment. The surface energy divided into disperse and polar part is determined before and after plasma treatment. To estimate the adhesion, the work of adhesion between substrates and four different cured coatings is evaluated. It is shown that surface energy, primarily the polar part, is increased considerably by the plasma treatment. In addition, by the increased work of adhesion an enhanced adhesion is expected, which is confirmed by cross‐cut tests.

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