abstract |
The present invention relates to a high-molecular weight polyimide used for a gas separation membrane and a method for synthesizing the same, and provides a polyimide containing 4,4'-(hexafluoroisopropylidene)diphthalic anhydride, 2,3,5,6-tetramethyl-1,4-phenylenediamine, and 1,3-bis[2-(4-aminophenyl)-2-propyl]-benzene. The present invention can provide a gas separation membrane having oxygen permeability and high oxygen selectivity. |