Effect of graphene oxide on the behavior of poly(amide‐6‐b‐ethylene oxide)/graphene oxide mixed‐matrix membranes in the permeation process

Polyether-block-amide (pebax)/graphene oxide (go) mixed-matrix membranes (mmms) were prepared with a solution casting method, and their gas-separation performance and mechanical properties were investigated. compared with the pristine pebax membrane, the crystallinity of the pebax/go mmms showed a little increase. the incorporation of go induced an increase in the elastic modulus, whereas the strain at break and tensile strength decreased. the apparent activation energies (e-p) of co2, n-2, h-2, and ch4 permeation through the pebax/go mmms increased because of the greater difficulty of polymer chain rotation. the e-p value of co2 changed from 16.5 kj/mol of the pristine pebax to 23.7 kj/mol of the pebax/go mmms with 3.85 vol % go. because of the impermeable nature of go, the gas permeabilities of the pebax/go mmms decreased remarkably with increasing go content, in particular for the larger gases. the co2 permeability of the pebax/go mmms with 3.85 vol % go decreased by about 70% of that of the pristine pebax membrane. rather than the maxwell model, the permeation properties of the pebax/go mmms could be described successfully with the lape model, which considered the influence of the geometrical shape and arrangement pattern of go on the gas transport. (c) 2015 wiley periodicals, inc. j. appl. polym. sci. 2015, 132, 42624.

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