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A natural flavonoid treatment of wood: artificial weathering and decay resistance
European Journal of Wood and Wood Products ( IF 2.6 ) Pub Date : 2020-07-30 , DOI: 10.1007/s00107-020-01578-x
Eylem D. Tomak , Mahmut A. Ermeydan

In this study, a natural flavonoid, chrysin, was used as a wood impregnation agent and evaluated in terms of artificial weathering and decay resistance of wood. For this purpose, Scots pine samples were impregnated with chrysin after tosylation pre-treatment and, then, exposed to artificial weathering for 672 h. Color, surface roughness, contact angle and macroscopic changes were recorded during the test period. Furthermore, surface chemical components and morphological changes were evaluated with ATR-FTIR and SEM, respectively. Decay resistance of samples was assessed using a brown-rot fungus (Coniophora puteana) and a white-rot fungus (Coriolus versicolor) for both leached and un-leached samples. In the results, chrysin impregnation was found efficacious in preventing C. puteana attack. However, a proper protection was not ensured against C. versicolor attack. Tosylation was effective in resisting decay by both fungi, but it was not effective in decreasing weathering degradation on the wood surface as chrysin impregnation did. Chrysin decreased color changes and surface roughness. In addition, surface hydrophobicity increased, and lignin degradation decreased with chrysin impregnation. Cracks on treated samples seemed to be an important disadvantage after exposure to weathering agents. Results of chrysin impregnation gave some promising results to improve service life of non/low-durable wood species in outdoor use.



中文翻译:

天然黄酮类木材处理:人工风化和抗腐烂

在这项研究中,天然类黄酮(chrysin)被用作木材浸渍剂,并根据人造气候和木材的耐腐性进行了评估。为此,在甲苯磺酰化预处理后,用松脂浸渍苏格兰松树样品,然后将其暴露在人工风化下672小时。在测试期间记录颜色,表面粗糙度,接触角和宏观变化。此外,分别用ATR-FTIR和SEM评估了表面化学成分和形态变化。对于浸出和未浸出的样品,使用褐腐真菌(Coniophora puteana)和白腐真菌(Coriolus versicolor)评估样品的耐腐性。结果发现,菊花胶的浸润可以有效地预防C. puteana攻击。但是,不能确保针对杂色衣原体的攻击没有适当的保护。甲苯磺酰化可有效抵抗两种真菌的腐烂,但不能像菊花胶那样有效地减少木材表面的风化降解。菊花精减少了颜色变化和表面粗糙度。此外,通过浸入白蜡胶,表面疏水性增加,木质素降解减少。暴露于风化剂后,处理过的样品上的裂纹似乎是一个重要的缺点。菊花胶的浸渍结果为改善非/低耐久性木材在户外使用中的使用寿命提供了一些有希望的结果。

更新日期:2020-07-31
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