GAS SEPARATION MEMBRANE COMPRISING FLUORINATED POLYIMIDE

摘要

[Problem] A diamine and a carboxylic dianhydride which were conventionally used as starting monomers in producing a hexafluoroisopropylidene-bearing polyimide were limited in chemical structure, so that it was difficult to design, using these starting monomers, the chemical structure of a membrane with consideration paid to the strength and separation performance as observed in use as a gas separation membrane. The purpose of the present invention is to produce a polyimide which exhibits high solubility in an organic solvent and excellent formability and is easily usable for a gas separation membrane and thereby obtain a gas separation membrane having excellent gas separation performance. [Solution] A gas separation membrane which comprises a polyimide that contains repeating units represented by general formula (1) [wherein R1 is a divalent organic group and R2 is a tetravalent organic group, R1 containing a 2-hydroxy-1,1,1,3,3,3-hexafluoroisopropyl (-C(CF3)2OH) group].