Effective and efficient transport mechanism of CO2 in subnano-porous crystalline membrane of syndiotactic polystyrene
Abstract
The gas permeation behavior in the single crystal of syndiotactic polystyrene (s-PS) S-I form was investigated in detail, in comparison to that in the s-PS form. The S-I form exhibits high CO2/N2 and CO2/CH4 separation factors while preserving its high CO2 permeability; a trade-off between selectivity and permeability was broken through.The mechanism of the effective and efficient transport of CO2 in the S-I form was examined in relation to the cavity structure in the crystal. Because the CO2 molecule is only fitted to the cavities in the S-I form, the solubility of CO2 becomes high. In addition, tri-atomic molecules can more effectively diffuse in the S-I form compared with di-atomic molecules, as proved by the "long-gas" model. A novel design criterion for the CO2 separation membranes is proposed based on the aspect of momentum transfer from polymer matrix to the penetrant.
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