Enhanced CO2 permeability of thermal crosslinking membrane via sulfonation/desulfonation of phenolphthalein-based cardo poly(arylene ether ketone)

摘要: Abstract Thermal crosslinking membranes for gas separation have excellent plasticization resistance compared to polymeric membranes. Their low permeability, however, is not high enough industrial application at cost. In this study, a method, called the sulfonation/desulfonation of precursor, was proposed enhance CO2 permeability thermal without significantly sacrificing CO2/CH4 selectivity. The effects degree sulfonation (DS) on chain rigidity, interchain distance, and performance were investigated using dynamic mechanical analysis, gravimetric analyser coupled with mass spectrometer, wide-angle X-ray diffraction, permeation tests. Results indicated that precursor influenced microstructure derived distance microvoids greatly enlarged by desulfonation reaction. rigidity improved formation hydrogen bonding induced –SO3H groups, which prevent melting membrane during heat treatment. markedly enhanced while selectivity decreased as DS increased. up 2.3 times higher than non-sulfonated membrane. positioned near or above 2008 Robeson upper bound.