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Modification of fibrous silicates surfaces with organic derivatives: An infrared spectroscopic study

Frost, Ray L. & Mendelovici, Efrain (2006) Modification of fibrous silicates surfaces with organic derivatives: An infrared spectroscopic study. Journal of Colloid and Interface Science, 294(1), 47 -52.

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Abstract

This contribution explores the interaction of the fibrous silicates, palygorskite, sepiolite and chrysotile with a wide range of organic agents. Infrared spectroscopy (IR) methods are essential for the characterization of solid surfaces and for the investigation of the kind of bonds formed between the surface of these silicates and the organic moieties. Thus, when sepiolite or palygorskite are treated e.g. with polyurethanes, isocyanates, amines or pyridines, specific Si-NH-C or Si-O-C bonds are derived from the linkage of the differently located OH groups in these fibrous silicates with the organic moieties. On the other hand, more stable, covalent Si-O-Si-C bondings are formed when the fibrous silicates, especially chrysotile, are reacted with heterofunctional silylating agents like chlorosilanes or ethoxysilanes carrying , alkyl, alkenyl or aryl groups. Such reactions may occur in presence or absence of HCl. An absorption band at 960 cm-1 -which we assigned to Si-OH groups- is detected only in presence of HCl. The evolution of this band is related to the degree of grafting of the organic radicals with the silanol groups of the silicates. HCl-generated silanol groups are the main bridges for the coupling of organosilyl groups on chrysotile and other silicates by covalent bonding, leading the way to the preparation of interesting new materials, including fibrous sheet polymers.

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48 citations in Scopus
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41 citations in Web of Science®

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ID Code: 2741
Item Type: Journal Article
Keywords: fibrous silicates, palygorskite, sepiolite, chrysotile, oragono clay Infrared spectroscopy
DOI: 10.1016/j.jcis.2005.07.014
ISSN: 0021-9797
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 23 Aug 2006
Last Modified: 29 Feb 2012 23:24

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