Abstract
Perfluoropolyether (PFPE) carboxylic surfactants have been prepared and characterized over a wide range of molecular weights and MW distributions. This class of surfactants has been found to be very effective in the mutual solubilization of water and PFPE fluids. Three-component mixtures comprising PFPE surfactant, PFPE oil and water yielded clear, monophasic and isotropic systems where the presence of microdroplets in the microemulsion size range (ca. 100 Å) has been detected by several techniques. Both W/O and O/W microemulsions could be formed depending upon the molecular parameters of surfactant and oil. The addition of a fourth component (alcohol) modifies the packing efficiency of the surfactant at the oil/water interface bringing about dramatic modifications in the phase behavior. The nature of the PFPE chain makes it possible to control the location of the fourth component: cosurfactant or cosolvent effect was found to depend upon the partition of the alcohol (fluorinated or alkanol) among water, oil and interface.
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