New types of cation-exchange membranes were prepared by grafting acrylic acid to substrates such as microporous polyethylene and homogeneous poly [1- (trimethylsilyl) -1-propyne] by the use of plasma graft polymerization technique. Ethylenediamine was immobilized by the electrostatic force in the ion exchange membranes as the carrier of CO
2 and the facilitated transport of CO
2 through the grafted membranes was studied. The obtained membrane showed remarkably high selectivity of CO
2 over N
2 and high CO
2 permeance. The newly prepared membrane was also stable. Membrane having tertiary amine group which has an affinity for CO
2, was also prepared by plasma grafting of 2- (N, N-dimethyl) aminoethyl methacrylate. It was suggested that the membrane acts as a fixed reaction site membrane under the water-containing condition. Furthermore, an approximate solution on the facilitated transport of CO
2 through a liquid membrane containing primary or secondary amine has been developed. The effect of chemical equilibrium constant on CO
2 permeance was quantitatively clarified by the simulation based on this approximate solution.
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