Study of urea intercalation into halloysite by thermoanalytical and spectroscopic techniques

Intercalation of a kaolinite-containing halloysite from Biela Hora (Slovakia) with urea was investigated by simultaneous TG–DTA, XRD, FTIR (DRIFT), and Raman spectroscopy. The process of intercalation and thermal deintercalation was followed for the as-prepared and the washed (with isopropanol) samp...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2011-07, Vol.105 (1), p.53-59
Main Authors: Horváth, E., Kristóf, J., Kurdi, R., Makó, É., Khunová, V.
Format: Article
Language:English
Subjects:
Analytical Chemistry
Calorimetry
Chemistry
Chemistry and Materials Science
Clay minerals
Company structure
Delaminating
Exact sciences and technology
General and physical chemistry
Inorganic Chemistry
Intercalation
Ion-exchange
Isopropanol
Kaolinite
Measurement Science and Instrumentation
Methods
Other ion exchangers: preparations and properties
Physical Chemistry
Polymer Sciences
Polypropylenes
Raman spectroscopy
Surface physical chemistry
Urea
Ureas
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Summary:Intercalation of a kaolinite-containing halloysite from Biela Hora (Slovakia) with urea was investigated by simultaneous TG–DTA, XRD, FTIR (DRIFT), and Raman spectroscopy. The process of intercalation and thermal deintercalation was followed for the as-prepared and the washed (with isopropanol) samples. The proposed structural model was supported by molecular mechanical calculations. Incorporation of the intercalate (in 5 wt%) in molten polypropylene at 200 °C resulted in the complete delamination of the mineral. It is supposed that gas formation as a result of urea decomposition between the layers prevents reorientation and restructuring of the layers.
ISSN:1388-6150
1588-2926
1572-8943
DOI:10.1007/s10973-011-1522-9