Preparation of rigid-group-bridged polysiloxanes/ethylcellulose mixed membranes for CO2 separation
Three types of rigid-group-bridged polysiloxanes-modified ethylcellulose(EC)mixed membranes were pre-pared by using three bridged-polysiloxanes with different rigid groups of hexafluoroimide,naphthalimide,and fluorene as modifiers and EC as a substrate,through solution co-blending and coating.The three mixed membranes exhibited a good film formation ability,high mechanical properties,and good thermal stability.Compared to pure EC membrane,the three mixed membranes gained an improvement in the permeability of CO2 without sacrificing selectivity(CO2/N2 and CO2/CH4).Especially,the naphthalimide bridged-polysiloxanes obtained a CO2 permeation coefficient of over 213 bar-rers,which is 4.9 times higher than pure EC membrane.
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