Skip to content
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Menu
Home
About Us
Resources
Profiles Metrics
Authors Directory
Institutions Directory
Top Authors
Top Institutions
Top Sponsors
AI Digest
Contact Us
Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemistry
Thermal degradation studies of alkyl-imidazolium salts and their application in nanocomposites
Thermochimica Acta, Volume 409, No. 1, Year 2004
Notification
URL copied to clipboard!
Description
Increasing the thermal stability of organically-modified layered silicates is one of the key points in the successful technical application of polymer-layered silicate nanocomposites on the industrial scale. To circumvent the detrimental effect of the lower thermal stability of alkyl ammonium-treated montmorillonite, a series of alkyl-imidazolium molten salts were prepared and characterized by elemental analysis, thermogravimetry (TGA) and thermal desorption mass spectroscopy (TDMS). The effect of counter ion, alkyl chain length and structural isomerism on the thermal stability of the imidazolium salts was investigated. Alkyl-imidazolium-treated montmorillonite clays were prepared by ion exchange of the imidazolium salts with Na-montmorillonite. These organically-modified clays were characterized by X-ray diffraction (XRD), TDMS and thermogravimetry coupled with Fourier transform infrared spectroscopy (TGA-FTIR), and compared to the conventional quaternary alkyl ammonium montmorillonite. Results indicate that the counter ion has an effect on the thermal stability of the imidazolium salts, and that imidazolium salts with PF6-, N(SO2CF3)2-, and BF4- anions are thermally more stable than the halide salts. A relationship was observed between the chain length of the alkyl group and the thermo-oxidative stability; as the chain length increased from propyl, butyl, decyl, hexadecyl, octadecyl to eicosyl, the stability decreased. The results also show that the imidazolium-treated montmorillonite has greater thermal stability compared to the imidazolium halide. Analysis of the decomposition products by FTIR provides an insight about the decomposition products which are water, carbon dioxide and hydrocarbons. © 2003 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Awad, Walid H.
United States, Gaithersburg
National Institute of Standards and Technology
Egypt, Giza
National Institute of Standards
Gilman, Jeffrey W.
United States, Gaithersburg
National Institute of Standards and Technology
Nyden, Marc
United States, Gaithersburg
National Institute of Standards and Technology
Harris, Richard H.
United States, Gaithersburg
National Institute of Standards and Technology
Sutto, Thomas E.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Callahan, John H.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Trulove, Paul C.
United States, Arlington
Air Force Office of Scientific Research
DeLong, Hugh C.
United States, Arlington
Air Force Office of Scientific Research
Fox, Douglas M.
United States, Washington, D.c.
U.s. Naval Research Laboratory
Statistics
Citations: 419
Authors: 9
Affiliations: 4
Identifiers
Doi:
10.1016/S0040-6031(03)00334-4
ISSN:
00406031
Research Areas
Environmental