FIELD: chemistry.
SUBSTANCE: present invention relates to a polyimide-polybenzoxazole copolymer, a method of producing said copolymer and a gas-separation membrane containing said copolymer. The polyimide-polybenzoxazole copolymer is a compound of formula:
, where values of radicals Ar1, Ar2, Ar3, Ar'2, Ar'3, Q, m and n are given in the claim. The method of producing the polyimide-polybenzoxazole copolymer involves heat treatment of a polyimide-polyhydroxyimide copolymer at 150-500°C for a period ranging from 5 minutes to 12 hours. Said copolymer exhibits excellent gas-permeability and gas-selectivity and is therefore suitable for use in gas-separation membranes of different forms, such as films, fibres or hollow fibres.
EFFECT: obtained gas-separation membranes can withstand aggressive conditions such as prolonged use, acidic conditions and high moisture owing to a hard polymer backbone chain present in the copolymer.
38 cl, 4 tbl, 14 dwg, 7 ex
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