期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 105, 期 1, 页码 53-59出版社
SPRINGER
DOI: 10.1007/s10973-011-1522-9
关键词
Halloysite; Intercalation; Urea; Thermal analysis; XRD; FTIR; Raman microscopy; Molecular mechanics
资金
- Hungarian Ministry of Culture and Education [TAMOP-4.2.208/1/2008-0018]
- State of Hungary
- European Union [TAMOP-4.2.1/B-09/1/KONV-2010-0003]
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 A degrees 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.
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