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Structure, wettability and thermal degradation of new fluoro-oligomer modified nanoclays

Valsecchi, R. and Vigano, M. and Levi, M. and Turri, S. (2008) Structure, wettability and thermal degradation of new fluoro-oligomer modified nanoclays. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 8 (4). pp. 1835-1841.

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Quaternary ammonium salts based on monofunctionalized Perfluoropolyether (PFPE) oligomers were synthesized and used for the cation exchange process of sodium Montmorillonite nanoclays. The new fluoromodified nanoclays were characterized through X-rays diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), termogravimetric analysis (TGA), differential scanning calorimetry (DSC), electronic microscopy (SEM-EDS), and contact angle measurements (CA). In particular XRD showed rather complex patterns (presence of higher order reflections) which allowed the calculation of basal spacings, regularly increasing with the molecular weight of the fluorinated macrocation. Both IR and SEM confirmed the presence of fluorinated segments at clays interface, while TGA showed a limited thermal stability with an onset of degradation temperature which seems not dependent on the molecular weight of the macrocation. CA measurements showed a peculiar behaviour, with evident dynamic hysteresis phenomena and surface tension components quite different from those of commercially available, organomodified clays.

Item Type:Article
Uncontrolled Keywords:nanoclays; perfluoropolyether; XRD; thermal behaviour; contact angle
Subjects:Analytical Science > Microscopy and probe methods
Material Science > Nanostructured materials
ID Code:6073
Deposited By:IoN
Deposited On:06 Aug 2009 10:06
Last Modified:06 Aug 2009 10:06

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