Grafted organic derivatives of kaolinite: I. Synthesis, chemical and rheological characterization

Clay Minerals - Tập 40 Số 4 - Trang 537-546 - 2005
J. E. F. C. Gardolinski1, G. Lagaly1
1Institute of Inorganic Chemistry University of Kiel D-24098 Kiel Germany

Tóm tắt

AbstractSeveral new interlayer-grafted derivatives of kaolinite were synthesized by esterification of inner-surface hydroxyl groups with alkanols, diols and glycol mono-ethers starting with the dimethyl sulphoxide intercalate. The derivatives were characterized by X-ray powder diffractometry, thermal analysis, Fourier transform infrared spectroscopy and transmission electron microscopy. The grafted molecules are arranged in monolayers between the kaolinite layers, with typical basal spacings of ~11.3 Å. Rheological studies of aqueous dispersions of the modified kaolinites revealed an exponential increase of the yield value and apparent viscosity with increasing alkyl chain length of the grafted molecules.

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Clay Minerals

Tập 40 Số 4

537-546

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