Gas separation performance of copolymers of perfluoro(butenyl vinyl ether) and perfluoro(2,2-dimethyl-1,3-dioxole)

Amorphous glassy perfluorinated polymers have high gas permeability, are chemically inert, thermally stable and known for their superior separation performance several pairs. In the current study, of copolymers perfluoro(butenyl vinyl ether) (PBVE) perfluoro(2,2-dimethyl-1,3-dioxole) (PDD) with two different monomer ratios, commercially as CyclAFlor™, was studied first time, both at 35 °C higher temperatures below glass transition temperature. For comparison, temperature dependence Cytop® (a homopolymer PBVE) studied. The mole percentage PBVE, lower permeability selectivity all pairs interest. All coefficients in were than those reported literature except helium hydrogen due to annealing protocol used, enhancing He/gas H2/gas selectivity. poly(PBVE-co-PDD) exhibited vicinity Robeson 2008 upper bound many pairs, including He/H2, He/CH4, He/N2 N2/CH4. particular, poly(50%PBVE-co-50%PDD) more permeable Hyflon® AD 60 but selective most Both showed increasing H2/CO2 While pressure up 10 bar °C, a change activation energy permeation CO2 suggested that changes polymer structure had occurred, possibly reducing Mixed measurements confirmed suitability CyclAFlor™ CO2/CH4 compared Cytop®.