利用硅烷偶联剂(KH-570)对表面包覆氧化硅的金红石相纳米TiO2进行了有机表面改性. 采用红外光谱(IR)、X射线光电子能谱(XPS)、热分析(TG-DTA)、透射电镜(TEM)和润湿性实验等分析手段对表面改性前后的纳米TiO2进行了表征. 红外光谱和X射线光电子能谱表明, KH-570以化学键合的方式结合在纳米TiO2的表面, 并形成了有机包覆层. 经测量, 纳米TiO2表面包覆的KH-570的质量分数约为7.42%～8.59%. 润湿性实验显示, 经KH-570表面改性的纳米TiO2具有疏水性. 力学性能实验表明, 经KH-570表面改性的纳米TiO2能同时提高复合材料的强度和韧性.
The surface modification with silane coupling reagent KH-570 of nanosized TiO2 in the rutile phase pre-coated with silica, was studied. The prepared samples were characterized by FT-IR, XPS,TEM, TG and DTA techniques. According to the spectra of FT-IR and XPS, it can be inferred that the KH-570 is bound on the surface of nanosized TiO2 particles and an organic coating layer is formed. The mass fraction of KH-570 coated on the surface of nanosized TiO2 measured is about 7.42%～8.59%.The wetting experiments show that the hydrophobicity of nanosized TiO2 modified with KH-570 is improved. Mechanical tests reveal that the strength and toughness of the nanosized TiO2 modified with KH-570 are improved simultaneously.
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