Innovative Treatment of Ancient Architectural Wood Using Polyvinyl Alcohol and Methyltrimethoxysilane for Improved Waterproofing, Dimensional Stability, and Self-Cleaning Properties
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引用次数: 0
Abstract
This study introduced a novel two-step treatment to enhance the waterproofing, dimensional stability, and self-cleaning capabilities of ancient architectural wood. The process was initiated with the immersion of wood in an organic hybrid sol, composed of an acidic methyltrimethoxysilane (MTMS)-based silica sol and polyvinyl alcohol (PVA), which effectively sealed the wood’s inherent pores and cracks to mitigate degradation effects caused by aging, fungi, and insects. Subsequently, the treated wood surface was modified with an alkaline MTMS-based silica sol to form a functional superhydrophobic protective layer. The modification effectiveness was meticulously analyzed using advanced characterization techniques, including scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX), Fourier-transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). The results demonstrated substantial improvements: the modified wood’s water contact angle (WCA) reached 156.0°, and the sliding angle (SA) was 6.0°. Additionally, the modified wood showed a notable reduction in water uptake and moisture absorption, enhancing its dimensional stability. The superhydrophobic surface endowed the wood with excellent self-cleaning properties and robust resistance to pollution. Enhanced mechanical durability of superhydrophobic surface was observed under rigorous testing conditions, including sandpaper abrasion and tape peeling. Furthermore, the modification improved the thermal stability, compressive strength, and storage modulus of the wood. Collectively, these enhancements render this modification a potent methodology for the preservation and functional augmentation of historic architectural woodwork.
这项研究采用了一种新颖的两步处理方法来增强古建筑木材的防水性、尺寸稳定性和自洁能力。首先将木材浸泡在由酸性甲基三甲氧基硅烷(MTMS)硅溶胶和聚乙烯醇(PVA)组成的有机混合溶胶中,这样就能有效封堵木材固有的孔隙和裂缝,减轻老化、真菌和昆虫造成的降解效应。随后,用碱性 MTMS 硅溶胶对处理过的木材表面进行改性,形成功能性超疏水保护层。利用先进的表征技术,包括扫描电子显微镜与能量色散 X 射线光谱(SEM-EDX)、傅立叶变换红外光谱(FT-IR)、X 射线光电子能谱(XPS)和 X 射线衍射(XRD),对改性效果进行了细致的分析。结果表明,改性木材的水接触角(WCA)达到了 156.0°,滑动角(SA)为 6.0°。此外,改性木材的吸水率和吸湿率明显降低,尺寸稳定性也有所提高。超疏水性表面赋予了木材出色的自洁性能和强大的抗污染能力。在严格的测试条件下,包括砂纸磨损和胶带剥离,超疏水表面的机械耐久性得到了增强。此外,改性还提高了木材的热稳定性、抗压强度和储存模量。总之,这些改进使这种改性成为一种有效的方法,可用于历史建筑木制品的保护和功能增强。
期刊介绍:
Forests (ISSN 1999-4907) is an international and cross-disciplinary scholarly journal of forestry and forest ecology. It publishes research papers, short communications and review papers. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles.