Preparation of poly(amide-12-b-ethylene oxide)/polyethylene glycol blend membrane and its permeation properties

Block copolymer poly(amide-12-b-ethylene oxide)(Pebax1074) and polyethylene glycol(PEG400) are used to prepare dense Pebax1074/PEG400 blend membranes with different mass ratio by polymer blending and casting method.PEG400 as a plasticizer,it can increase polymer chain flexibility and EO units,resulting in the increase in gas permeability and selectivity of CO2/light gas.The operating conditions also influence the performance of Pebax1074/PEG400 blend membranes.Due to hydrostatic pressure and plasticization effect,the gas permeability of N2,CH4,H2 and CO2 changes differently with the increase in transmembrane pressure.The permeability of different gases increases as temperature increasing,the temperature dependence of gas permeability is correlated with the apparent activation energy of permeation according to Arrhenius equation.