METHOD OF PRODUCING THERMALLY REGROUPED PBX, THERMALLY REGROUPED PBX AND MEMBRANE CONTAINING THEREOF

摘要

The present invention concerns a method of producing a thermally rearranged polybenzoxazole, polybenzimidazole or polybenzothiazole (collectively denominated "TR PBX"), thermally arranged PBX and membranes comprising the same. The inventive method includes the method steps: - preparing a polyimide or aromatic polyamide as a precursor polymer in a solution, wherein in each recurring monomer unit of the precursor polymer an aromatic ring is located adjacent to the nitrogen atom of the imide group or amide group of the monomer unit, wherein the aromatic ring is functionalized with an -XR group at the ortho-position to the nitrogen atom, wherein X=O, N or S, and - performing a thermal treatment to carry out a thermal rear-rangement resulting in the thermally rearranged polybenzoxazole, polybenzimidazole or polybenzothiazole, wherein R is an allyl group or an allyl-based group.