高岭石/乙酰胺插层复合物的制备及结构表征

乙酰胺在熔融状态下直接插层高岭石，产物经无水乙醇洗涤，得到纯净的高岭石／乙酰胺插层复合物。XRD结果显示高岭石层间距从0．721nm膨胀到1．102nm。插层作用使得高岭石内表面羟基伸缩振动峰由3651cm^-1。移动至3647cm^-1。处，变形振动峰由911cm^-1移动至907cm^-1处；乙酰胺3211cm^-1和3390cm^-1处NH2基伸缩振动峰消失，并在3478cm^-1处产生一新的振动峰，这些表明原高岭石层问氢键的损失及与乙酰胺分子之间氢键的形成。高岭石内羟基的吸收峰由3616cm^-1移动至3611cm^-1处，以及其硅氧面的骨架振动峰变化表明乙酰胺的甲基中CH嵌入到高岭石的复三方空穴中。进而构建高岭石／乙酰胺插层复合物的结构模型，结果表明该模型的理论计算值与实际测量结果具有很好的一致性。

PREPARATION AND MICROSTRUCTURE OF KAOLINITE-ACETAMIDE INTERCALATION COMPOUNDS

Acetamide was intercalated into kaolinite directly by melting intercalation method. The pure kaolinite-acetamide intercalation compounds are obtained by washing products with ethanol in the absence of water. The basal spacing of kaolinite-acetamide intercalation compounds increased to 1. 102 nm from 0. 721 nm. Intercalation caused red shifts of the inner surface OH stretching bands from 3 651 cm^-1 to 3 647 cm^-1 in the kaolinite-acetamide intercalation compounds and deforming bands from 911 cm^-1 to 907 cm^-1 ,and the NH vibrations at 3 211 cm^-1 and 3 390 cm^-1 disappeared with a new band appearing at 3 478 cm^-1. These Ir band changes implied the breaking of the H-bonds between layers of kaolinite and the formation of new H-bonds between the inner-surface hydroxyls of the kaolinite and the amino groups of acetamide in the intercalation compounds. The shifts of both the inner OH stretching bands from 3 616 cm^-1 to 3 611 cm^-1 and the Si-O bands of kaolinite showed acetamide CH group was partly keyed into the ditrigonal hole. A model was provided to analyse the microstructure of kaolinite-acetamide intercalation compounds. The results show that computation data is in good agreement with experimental data.