This research focuses on increasing wood resistance against UV degradation using trimethoxyphenylsilane as modifying agent and supercritical CO2 as a green solvent and reaction medium. Trimethoxyphenylsilane was successfully grafted on European spruce (Picea abies, H. Karst) and was characterized by SEM-EDX and UV–vis reflectance. SEM-EDX showed the presence of silicium inside the wood cell wall. Increased wood moisture content showed positive effect on weight gain of trimethoxyphenylsilane after treatment. UV resistance of treated wood was evaluated by following the color change during artificial weathering. Modified samples showed improved weathering resistance compared to unmodified wood with a ΔE value around 5 after 260 h. Processing and modifying wood using supercritical CO2 is a promising route to increase wood performances and increase its use as a building material.

中文翻译：

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通过超临界二氧化碳使用三甲氧基苯基硅烷对木材进行改性，以增强耐候性


本研究的重点是使用三甲氧基苯基硅烷作为改性剂和超临界二氧化碳作为绿色溶剂和反应介质来提高木材的抗紫外线降解性。三甲氧基苯基硅烷已成功接枝到欧洲云杉（Picea abies、H. Karst）上，并通过 SEM-EDX 和紫外可见反射率进行了表征。 SEM-EDX 显示木材细胞壁内存在硅。木材含水量的增加对处理后三甲氧基苯基硅烷的重量增加产生积极影响。通过跟踪人工风化过程中的颜色变化来评估经过处理的木材的抗紫外线能力。与未改性木材相比，改性样品的耐候性得到改善，260 小时后 ΔE 值约为 5。使用超临界二氧化碳加工和改性木材是提高木材性能和增加其作为建筑材料用途的一条有前途的途径。