Fig. 14
From: Silica applied as mixed matrix membrane inorganic filler for gas separation: a review
CO2/ CH4 selectivity of MMMs compared to Robeson upper bound [63] (PBI: polybenzimidazole; ETPU: polyetherurethane; ESPU: polyesterurethane; PU: polyurethane; PSf: polysulfone; 6FDA-DAM-DABA: (4,4’hexafluoroisopropylidene diphthalic anhydride) – (2,4,6-trimethyl-1,3-diaminobenzene) – (3,5-diaminobenzoic acid); PEBAX: polyether block amide; PEI: polyethyleneimine; PES: polyethersulfone; SPEEK: sulfonated polyether ether ketone; PBO-6FAHP-OBC: (polybenzoxazole) – (2,2-bis 3-amino-4-hydro-xyphenyl hexafluoropropane) – (4,4′-oxybis benzoic acid chloride)