Perfluoropolyether Characterization by Gas-Liquid Chromatography

Abstract del lavoro presentato al "Xth European Symposium on Fluorine Chemistry", Padova, 20-25 settembre 1992 - The thermodynamic behaviour of organic mixtures containing perfluorocompounds of high molecular weights is, at present, to some extent unknown. The infinite-dilution-activity coefficient of a solvent in a copolymer is a thermodynamic property which can give useful information about the interactions between the components. Reliable and accurate structure and molecular weight data can be obtained by GLC so that the characterization of polymers can be performed. In this paper infinite-dilution-activity coefficients of paraffin, cycloparaffins, olefins, aromatics, alcohols, ketones, acetates, ethers, chloro- and nitro-compounds are determined in perfluoropolyethers and perfluoroalkylpolyethers with varying molecular weights. An analysis of polymer behaviour is provided and discussed.