Gas Separation Membrane

Abstract

[Problem] Diamine and carboxylic dianhydride for polymerizing a hexafluoroisopropylidene group-containing polyimide are limited in chemical structure when developed into a polyimide membrane, so that it is difficult to design a chemical structure with consideration paid to the strength and separation performance of a gas separation membrane. A gas separation membrane easily soluble in an organic solvent, excellent in formability so as to be readily usable for a gas separation membrane, and excellent in gas separation performance is obtained. [Solution] A gas separation membrane, including: a polyimide that contains a repeating unit represented by general formula (1). [In the formula (1), 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 group (—C(CF3)2OH).]

Dependencies are inferred from the claim text.