Title

Thermally Stable Organically Modified Layered Silicates Based on Alkyl Imidazolium Salts

Document Type

Article

Publication Date

2-1-2012

Department

Polymers and High Performance Materials

Abstract

A series of imidazolium salts having various substituents and functional groups were synthesized and characterized by FTIR and NMR spectroscopy. Organic modification of natural and synthetic layered silicates involving montmorillonite (MMT), laponite (lap), and synthetic mica (mica) was carried out by ion-exchange reaction. The obtained organo-clays were characterized by FTIR and powder X-ray diffraction techniques. Results indicate that these organically modified clays have much higher thermal stabilities compared to their corresponding imidazolium halides. It was also observed from TGA analysis that thermal stability does not depend on the functional group present at the 3-position of the imidazolium salts. These studies strongly supports premise that the removal of halide is necessary to improve the thermal stability of the organo-clay produced. (C) 2011 Elsevier Inc. All rights reserved.

Publication Title

Journal of Colloid and Interface Science

Volume

368

Issue

1

First Page

366

Last Page

371