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以高岭石-甲醇(K-M)复合物为前驱体,利用置换法于常温下制备了3种高岭石-氨基硅烷插层复合物。用X射线衍射、Fourier变换红外光谱仪、透射电子显微镜、热分析仪等对复合物进行了表征。结果表明:3种高岭石-氨基硅烷插层复合物的层间距均扩大至2nm以上,插层率都大于95%。3种氨基硅烷分子均和K-M前驱体的甲氧基共同存在于高岭石层间,均呈两层倾斜排列,倾斜程度不同。氨基硅烷的插入破坏了高岭石层间的氢键,加剧了高岭石自身结构中硅氧四面体片层与铝氧八面体片层之间的错位,使得复合物片层出现不同程度的卷曲变形。3种高岭石-氨基硅烷插层复合物的热分解过程均分三步进行:表面水的蒸发及层间甲氧基的脱嵌分解、插层剂氨基硅烷分子的脱嵌、高岭石脱羟基。
Using kaolinite-methanol (K-M) as precursor, three kaolinite-aminosilane intercalation complexes were prepared at room temperature by displacement method. The composite was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, thermal analysis and so on. The results show that the interlaminar spacing of the three kaolinite - aminosilane intercalation complexes both extend to more than 2 nm, and the intercalation rates are both above 95%. The three kinds of aminosilane molecules exist together with the methoxy groups of K-M precursors in the kaolinite layers, both of which are arranged obliquely and have different degrees of inclination. The insertion of aminosilane destroys the hydrogen bonds between the kaolinite layers and aggravates the dislocation between the siloxane tetrahedron layer and the aluminum oxy-octahedron layer in the self-structure of kaolinite, resulting in different degrees of Curl distortion. Three kinds of kaolinite - aminosilane intercalation complexes thermal decomposition process is divided into three steps: the evaporation of the surface water and intercalation methoxy de-decomposition, intercalation aminosilane molecules de-embedded, kaolinite Dehydroxy.