Abstract
The stability of emulsions of perfluoroorganic compounds (more than twenty) of various classes has been investigated: polycyclic compounds and their alkyl derivatives, alkyl- and cycloalkylamines, alkyl ethers. Emulsions of perfluoroorganic compounds were prepared on the basis of block copolymer of ethylene oxide and propylene oxide with molecular mass of about 8000 and 80% of oxyethylene moiety in the molecule, and a fluorosurfactant C 6F 13CH 2−SO 2NH(OC 2H 4) 16OH. The stability of emulsion of perfluoroorganic compounds (of the same class) stabilized by the block copolymer has been found to vary linearly with the number of carbon atoms as a plot of 1g K−n c, where K is the constant of enlargement of species obtained as the tangent of the angle formed by a slope of medium-diameter species cube vs. time; n c, the number of carbon atoms in a perfluoroorganic molecule. Emulsions of perfluorinated alkyl ethers and alkylamines have the highest stability, while lowest stability has been observed for polycyclic compounds. For fluorosurfactant-stabilized emulsions, the tendencies of stability variation are similar to those obtained for the block copolymer emulsions. The stability of fluorosurfactant emulsions was higher than that of block copolymer emulsions.
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