FIELD: chemistry.
SUBSTANCE: invention relates to gas separation membranes. A gas separation membrane includes a polyimide having a repeating unit of general formula
In formula (1) R1 is a divalent organic group and R2 is a tetravalent organic group. R1 contains a 2-hydroxy-1,1,1,3,3,3-hexafluoroisopropyl group or a 2-hydroxy-1,1,1,3,3,3-hexafluoroisopropyl group in which the hydrogen atom of the OH group is substituted with a glycidyl group.
EFFECT: invention enables to obtain a polyimide which exhibits high solubility in an organic solvent and excellent mouldability, and is also well applicable for a gas separation membrane.
19 cl, 10 tbl
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