13C-NMR Evidence on Amphiphile Lifetime in Reverse (Water-in-Oil) Micelles Formed by a Poloxamer Block Copolymer

The dynamics of exchange between amphiphile assembled in reverse (water-in-oil) micelles and unimer (free in solution) amphiphile were probed by13C-NMR spectroscopy in a ternary isothermal system consisting of a poly(ethylene oxide)-poly(propylene oxide) block copolymer (poloxamer), water, and xylen...

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Veröffentlicht in:	Journal of colloid and interface science 1998-10, Vol.206 (1), p.357-360
Hauptverfasser:	Barreleiro, Paula C.A., Alexandridis, Paschalis
Format:	Artikel
Sprache:	eng
Schlagworte:	13C-NMR block copolymer Chemistry Colloidal state and disperse state dynamics Exact sciences and technology General and physical chemistry Micelles. Thin films poloxamer poly(ethylene oxide) poly(propylene oxide) reverse micelles
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Beschreibung
Zusammenfassung:	The dynamics of exchange between amphiphile assembled in reverse (water-in-oil) micelles and unimer (free in solution) amphiphile were probed by13C-NMR spectroscopy in a ternary isothermal system consisting of a poly(ethylene oxide)-poly(propylene oxide) block copolymer (poloxamer), water, and xylene. An upper bound was obtained for the lifetime of a block copolymer molecule within the reverse micelle, using the theoretical treatment of exchange phenomena in NMR which is based on extensions of the Bloch equations.
ISSN:	0021-9797 1095-7103
DOI:	10.1006/jcis.1998.5702