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 by 13C-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. Copyright 1998 Academic Press.
Center for Chemistry and Chemical Engineering, Lund University, Lund, S-22100, Sweden
PCA
Barreleiro
P
Alexandridis