POLARITY OF FLUORINE-CONTAINING OXYETHYLATES AS DETERMINED BY INVERSEGAS-CHROMATOGRAPHY

The polarity of fluorine-containing oxyethylates has been studied usin g inverse gas chromatography. Oxyethylene derivatives containing a sho rt fluorocarbon chain (denoted as Group I) exhibit a slightly higher p olarity at all temperatures than their analogues (Group II) having dou ble-length fluorocarbon chains. The difference decreases, however, wit h increasing length of the oligo-oxyethylene chain. An increase in the average number of oxyethylene units increases the polarity of the pro ducts. The changes in oxyethylate polarity may be described by various parameters, i.e. the sum of the difference of the retention indices o f the first five McReynolds solutes as determined on the examined liqu id phase and on squalane as a reference, the polarity index, the rho c oefficient and the dispersive interaction parameters.