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首页> 外文期刊>Materials Science Research International >Topochemistry of SiO{sub}2 wood-inorganic composites for enhancing water-repellency
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Topochemistry of SiO{sub}2 wood-inorganic composites for enhancing water-repellency

机译：SiO {sub} 2木材-无机复合材料的拓扑化学增强疏水性

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Methyltrimethoxysilane (MTMOS) was used to prepare the SiO{sub}2 wood-inorganic composites. To enhance the properties of these composites, 2-heptadecafiuorooctylethyltrimethoxysilane (HFOETMOS) as a property enhancer was added to this reaction system for SiO{sub}2 wood-inorganic composites. To elucidate the mechanism for enhancing the water-repellent property in the HFOETMOS-SiO{sub}2 wood-inorganic composites, the composites with various weight percent gains (WPGs) were prepared, and the prepared composites with the lower WPG revealed the better property in water-repellency, whereas those with the higher WPG could not attain the high water-repellent property. SEM-EDXA analysis on these composites revealed that the HFOETMOS-derived residues were concentrated on the boundary between the cell wall and cell lumen in both composites with the lower and higher WPGs, while SiO{sub}2 gels were almost uniformly distributed within the cell walls in the composites with lower WPG. SiO{sub}2 gels in the composites with higher WPG were distributed in a similar manner but slightly higher in its concentration at the boundary between the cell wall and cell lumen. From these results, it was assumed that for the composites with lower WPG, the cell wall would be covered with the long hydrophobic alkyl residue of the HFOETMOS, whereas for the composites with higher WPG, SiO{sub}2 gels formed in the cell lumen would have prevented HFOETMOS-derived residues from being exposed uniformly over the surface of cell wall. This may be why the different water-repellent properties were shown between the composites with higher and lower WPGs. These results suggest that the topo-chemical effects of the SiO{sub}2 gels and HFOETMOS-derived residues exist for the enhancement of water-repellent property.
机译：甲基三甲氧基硅烷（MTMOS）用于制备SiO {sub} 2木材-无机复合材料。为了增强这些复合材料的性能，向该SiO {sub} 2木材-无机复合材料的反应体系中添加了2-十七碳六氟辛基乙基三甲氧基硅烷（HFOETMOS）作为性能增强剂。为了阐明增强HFOETMOS-SiO {sub} 2木材-无机复合材料的憎水性能的机理，制备了具有不同重量百分数增加量（WPG）的复合材料，并且所制备的WPG较低的复合材料显示出更好的性能。在防水性方面，而具有较高WPG的那些不能获得高防水性。 SEM-EDXA对这些复合材料的分析表明，HFOETMOS衍生的残留物集中在具有较低和较高WPG的两种复合材料的细胞壁和细胞腔之间的边界上，而SiO {sub} 2凝胶几乎均匀地分布在细胞内WPG较低的复合材料中的壁。具有较高WPG的复合材料中的SiO {sub} 2凝胶以相似的方式分布，但其浓度在细胞壁与细胞腔之间的边界处略高。根据这些结果，假定对于具有较低WPG的复合材料，细胞壁将被HFOETMOS的长疏水烷基残基覆盖，而对于具有较高WPG的复合材料，在细胞腔中形成SiO {sub} 2凝胶本来可以防止HFOETMOS衍生的残留物均匀地暴露在细胞壁表面上。这可能就是为什么在具有较高和较低WPG的复合材料之间显示出不同的拒水性能的原因。这些结果表明存在SiO {sub} 2凝胶和HFOETMOS衍生的残留物的拓扑化学作用，以增强疏水性。

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