The effect of air plasma treatment at atmospheric pressure on thermally modified wood surfaces
The effect of air plasma treatment at atmospheric pressure on thermally modified wood surfaces
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DOI：
10.1007/s00226-016-0856-7
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发表时间：
2016-11-01
影响因子：
3.4
通讯作者：
Mai, Carsten
中科院分区：
文献类型：
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作者：
Altgen, Daniela;Avramidis, Georg;Mai, Carsten
本研究验证了木材热改性影响空气等离子体处理效果的假设。欧洲山毛榉，苏格兰松和挪威云杉的微单板在两个不同的温度下进行热改性，随后等离子体处理1和3秒。单板表面的特征在于在形态，润湿行为和表面化学。通过扫描电子显微镜观察到，由于等离子体处理的单板表面没有严重的变化。等离子体处理提高了木材的表面自由能和对水和脲醛胶粘剂的润湿性，对热改性木材比未改性木材更有效。X射线光电子能谱分析表明，热改性和未改性山毛榉木材等离子体处理后，木材表面含氧官能团的分布相似。有人建议，通过等离子体处理增强润湿性是由于生成的羧基内的木质素网络，这有助于表面自由能的极性部分。热改性木材的等离子体处理的高效率，因此可以解释其高的相对比例的木质素。
This study tests the hypothesis that thermal modification of wood influences the effectivity of air plasma treatment. Micro-veneers of European beech, Scots pine and Norway spruce were thermally modified at two different temperatures and subsequently plasma-treated for 1 and 3 s. The veneer surfaces were characterized in terms of morphology, wetting behaviour and surface chemistry. No severe changes in the veneer surfaces due to plasma treatment were observed by scanning electron microscopy. Plasma treatment increased surface free energy and wettability by water and urea-formaldehyde adhesive; it was more effective on thermally modified wood than on unmodified wood. X-ray photoelectron spectroscopy revealed a similar distribution of oxygen-containing functional groups on the wood surface after plasma treatment of thermally modified and unmodified beech wood. It is suggested that enhanced wettability through plasma treatment is due to the generation of carboxyl groups within the lignin network, which contribute to the polar part of the surface free energy. The high effectiveness of plasma treatment on thermally modified wood might thus be explained by its high relative proportion of lignin.