METHOD FOR SEPARATING VARIETIES OF PERFLUOROPOLYOXYALKYLENES WITH NONFUNCTIONAL, MONOFUNCTIONAL, AND BIFUNCTIONAL GROUPS Russian patent published in 1998 - IPC

FIELD: chromatographic separation of polymer compounds. SUBSTANCE: solution of perfluoropolyoxyalkylenes is introduced into head part of chromatographic column in minimal amount of mixture consisting of nonpolar fluorinated solvent possessing eluting force equal to at least 0.2 as compared to silica gel, and elution is carried out in two steps. In the first step, elution is performed with nonpolar fluorinated solvent, and, in the second step, process is resumed with mixture of nonpolar and polar solvents. Stationary phase in chromatographic column constitutes a compound containing active sites and/or groups capable to form linkages with end hydroxyl groups of perfluoropolyoxyalkylenes. EFFECT: enhanced separation efficiency. 7 cl, 1 dwg, 1 tbl