Abstract
Since the discovery of polytetrafluoroethylene (PTFE) in 1938, fluorinated polymers have drawn attention in the chemical and pharmaceutical field, as well as in optical and microelectronics applications. The reasons for this attention are their high thermal and oxidative stability, excellent chemical resistance, superior electrical insulating ability, and optical transmission properties. Despite their unprecedented combination of desirable attributes, PTFE and copolymers of tetrafluoroethylene (TFE) with hexafluoropropylene and perfluoropropylvinylether are crystalline and exhibit poor solubility in solvents, which makes their processability very challenging. Since the 1980s, several classes of solvent-soluble amorphous perfluorinated polymers showing even better optical and gas transport properties were developed and commercialized. Amorphous perfluoropolymers exhibit, however, moderate selectivity in gas and liquid separations. Recently, we have synthesized various new perfluorodioxolane polymers which are amorphous, soluble, chemically and thermally stable, while exhibiting much enhanced selectivity. In this article, we review state-of-the-art and recent progress in these perfluorodioxolane polymers for gas separation membrane applications.
Highlights
Fluorinated polymers have been used extensively due to their high thermal and oxidative stability, excellent chemical resistance, superior electrical insulating ability, and unique optical properties [1,2,3].Polytetrafluoroethylene (PTFE) and its copolymers with hexafluoropropylene and perfluoropropylvinyl compounds are crystalline and have poor optical transparency and solubility
Perfluorodioxolane polymers exhibit much higher He/CH4 selectivity compared to commercial perfluoropolymers and seem promising
He/CH4 separation. membranes are currently being developed for a number of membrane gas separations including helium recovery and CO2 removal from natural gas resource
Summary
Fluorinated polymers have been used extensively due to their high thermal and oxidative stability, excellent chemical resistance, superior electrical insulating ability, and unique optical properties [1,2,3]. These perfluoropolymers are amorphous and soluble in fluorinated solvents, and form plasticization [7,8,9,10,11,12,13,14,15,16,17] They exhibit better resistance to thin-film physical aging than hydrocarbon thin and continuous. Which make them appealing as gas separation membrane materials [20,21,22,23,24,25,26,27,28,29] These perfluoropolymers are amorphous and soluble in fluorinated solvents, and form thin and continuous films. Teflon AF and Hyflon AD are a family of copolymers of tetrafluoroethylene (TFE) with (I)
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