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Clay Minerals; December 2005; v. 40; no. 4; p. 537-546; DOI: 10.1180/0009855054040190
© 2005 Mineralogical Society of Great Britain and Ireland
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Research Paper

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

J. E. F. C. GARDOLINSKI* and G. LAGALY

Institute of Inorganic Chemistry, University of Kiel, D-24098, Kiel, Germany

* E-mail: jegardol{at}yahoo.com

(Received 17 May 2005; revised 27 September 2005)

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.

KEYWORDS: dispersion, grafting, intercalation, kaolinite, rheology




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