DIBLOCK SEMIFLUORINATED N-ALKANES PURIFICATION BY GEL PHASE-FORMATIONIN ORGANIC-SOLVENTS - C8F17C18H37 IN ALCOHOLS

The formation of a gel-like phase observed with some diblock semifluor inated n-alkanes dissolved in organic solvents was investigated as a p urification method for these compounds. Experiments were carried out w ith F(CF2)(8)(CH2)(18)H by using absolute ethanol or methanol as solve nt. Starting from samples with different initial degrees of purity, an d using a very strict methodology, the amount of solvent giving the hi ghest yield of purification was determined. The different solubilizing power of the solvents used did not greatly influenced the purificatio n process. Different cooling rates were also investigated, but only sm all influences on the treatment effectiveness were observed. (C) 1997 Elsevier Science S.A.