Accession Number : AD0284783

Title :   RESEARCH ON AROMATIC POLYMERS FOR THERMALLY-STABLE FIBERS AND FILMS

Corporate Author : DU PONT DE NEMOURS (E I) AND CO WILMINGTON DE

Personal Author(s) : FRAZER, AUGUST H. ; KANE, JAMES J. ; WALLENBERGER, FRED T.

Report Date : JUL 1962

Pagination or Media Count : 1

Abstract : Dimethylacetamide and dimethylsulfoxide were successfully employed as dry-spinning solvents for poly-2,2'-(m-phenylene)-5,5'-bibenzimidazole. The physical properties of both fibers appear comparable. Dimethylacetamide produces a lighter colored yarn and in general lends itself to easier solvent removal. The fibers exhibit remarkably high resistance to hydrolysis and thermal aging although under the more realistic condition of air aging the thermal properties are not nearly as impressive as under nitrogen. Oriented and crystalline polyhydrazide fibers can be converted by a unique cyclodehydration reaction into oriented and crystalline fibers of poly(1,3,4-oxadiazoles). Conversion of fibers of the polyhydrazide derived from equimolar amounts of isophthalic dihydrazide and terephthaloyl chloride gave fibers of poly(1,3/1,4-phenylene-2,5-(1,3,4oxadiazole), which have excellent retention of their fiber structure even when exposed to temperatures up to 400 C. for prolonged periods of time. (Author)

Descriptors :   *BENZIMIDAZOLES, *FIBERS, *FILMS, *HEAT RESISTANT PLASTICS, ACETAMIDES, AZOLES, HYDRAZINES, METHYL RADICALS, MOLECULAR STRUCTURE, PHENYL RADICALS, STABILITY, SULFOXIDES, TEMPERATURE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE