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

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Several 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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Keywords: DISPERSION; GRAFTING; INTERCALATION; KAOLINITE; RHEOLOGY

Document Type: Research Article

Publication date: 2005-12-01

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