Transport properties of cardo poly(imides): Homo- and copolymers

Permeability of new cardo poly(imides), homo- and copolymers, for light gas es such as He, H-2, O-2, N-2, CO2, and CH4 was studied. It was shown that t he introduction of cardo groups into poly(imides) leads to an increase in t he permeability coefficients. It was demonstrated that the transport parame ters of copoly(imides) can be predicted by the group contribution method. T he effect of a residual solvent on the gas permeability parameters was anal yzed. It was found that the removal of the residual solvent brings about a significant growth of gas permeability, while the selectivity of gas separa tion drops slightly or sometimes even increases.