FLUORINATED POLY(1,3,4-OXADIAZOLE-IMIDE-AMIDE)S

A series of new fluorinated poly(1,3,4-oxadiazole-imide-amide)s contai ning various ratios of amide/oxadiazole groups in the repeating unit h ave been prepared by cyclodehydration of the corresponding poly(hydraz ide-imide-amide)s resulting from the reaction of diacid dichlorides in corporating both hexafluoroisopropylidene bridges and imide rings with p-aminobenzhydrazide or with mixtures of certain aromatic diamines an d p-aminobenzhydrazide or terephthalic dihydrazide. The new polymers a re soluble in polar amidic solvents and can be processed into flexible films by casting from solution. Their glass transition temperatures a re in the range 254-325 degrees C and they are thermally stable up to 415-450 degrees C.