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Gas separation of 6FDA–6FpDA membranes: Effect of the solvent on polymer surfaces and permselectivity

AuthorsRecio, Roberto; Lozano López, Ángel Emilio ; Marcos-Fernández, Ángel ; Campa, José G. de la; Abajo González, Javier de
KeywordsFluorinated polyimides
Gas separation
Fractional free volume
Fractal dimension
Solubility parameter
Issue Date20-Apr-2007
CitationJournal of Membrane Science 293(1-2): 22-28 (2007)
AbstractThe aim of this work has been to analyze how different solvents used in the manufacture of gas separation membranes, based on 6FDA–6FpDA, influence permeability and selectivity. It has been shown that a low boiling point and/or a repulsive interaction between the solvent and the polymer increase both selectivity and permeability for O2/N2 and, specially, for CO2/CH4 gas pairs. These results have been explained in terms of fractional free volume and intersegmental mobility. In particular it has been shown that good solubility of the polymer results in a high glass transition temperature and planar surface as characterised by the fractal dimension of the resulting membranes, obtained from AFM analysis.
Description7 páginas, 10 figuras, 1 tabla.-- et al.
Publisher version (URL)http://dx.doi.org/10.1016/j.memsci.2007.01.022
Appears in Collections:(ICTP) Artículos
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