Asymmetric polyimide mebranes.

摘要

An asymmetric membrane and a method for preparation thereof, said membrane being suitable for gas separation, reverse osmosis and pervaporation applications and being characterized in that it is based on a fully imidized 5(6)-amino-1-(4'-aminophenyl)-1,3-trimethylindane polymer having pore diameters of less than 20 ANGSTROM units, CO2/CH4 selectivity of at least 20 and CO2 permeability of at least 1.0 SCFH/ft<2> at 100 p.s.i.