Abstract
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 CO2 and the facilitated transport of CO2 through the grafted membranes was studied. The obtained membrane showed remarkably high selectivity of CO2 over N2 and high CO2 permeance. The newly prepared membrane was also stable. Membrane having tertiary amine group which has an affinity for CO2, 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 CO2 through a liquid membrane containing primary or secondary amine has been developed. The effect of chemical equilibrium constant on CO2 permeance was quantitatively clarified by the simulation based on this approximate solution.
