Plasma treatment is becoming a mature technique for modification of surfaces of various materials, including wood. A better insight in the treatment process and the impact of the plasma on properties of wood bulk are still needed. The study was performed on Norway spruce and common beech wood, as well as their thermally modified variations. The formations of the airborne discharge, as well as mass changes of the treated wood, were monitored. The impact of such treatment on wood-coating interaction was investigated by evaluating the dynamic wettability and penetration into wood. At the wood surface, plasma streamers were observed more intense on denser latewood regions. Wood mass loss was higher with increasing number of passes through the plasma discharge and was lower for thermally modified wood than for unmodified wood. Plasma treatment increased the surface free energy of all wood species and lowered the contact angles of a waterborne coating, these together indicating enhanced wettability after treatment. Finally, the distribution and penetration depth of the coating were studied with X-ray microtomography. It was found that the coating penetrated deeper into beech than into spruce wood. However, the treatment with plasma increased the penetration of the coating only into spruce wood.

中文翻译：

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用大气等离子放电处理木材：研究处理过程、动态润湿性和与水性涂料的相互作用

等离子处理正在成为一种成熟的技术，用于改性包括木材在内的各种材料的表面。仍然需要更好地了解处理过程以及等离子体对散装木材特性的影响。该研究是对挪威云杉和普通山毛榉木材以及它们的热改性变化进行的。监测空气中排放物的形成以及处理过的木材的质量变化。通过评估动态润湿性和对木材的渗透，研究了这种处理对木材-涂料相互作用的影响。在木材表面，在密度较大的晚材区域观察到等离子流光更加强烈。随着通过等离子体放电次数的增加，木材质量损失更高，热改性木材的质量损失低于未改性木材。等离子处理增加了所有木材的表面自由能并降低了水性涂料的接触角，这些共同表明处理后润湿性增强。最后，通过X射线显微断层扫描研究了涂层的分布和穿透深度。发现涂层渗透到山毛榉木中比渗透到云杉木中更深。然而，等离子体处理仅增加了涂层对云杉木的渗透。