POLY(1,3,4-OXADIAZOLE) AND RELATED POLYMERS FOR THERMALLY-STABLE FIBERS.
Abstract
High molecular weight polyhydrazide (OIOT) was prepared. This material was spun from DMSO and DMAc and the resultant fibers subjected to drawing studies. Highly drawn OIOT fibers were converted to polyoxadiazole (PODZ) fiber by thermal cyclodehydration. This tough, highly oriented, crystalline fiber maintained over 60% of its straight tenacity after heating for 24 hrs at 400 C. in air. Undrawn OIOT fiber converted to PODZ much more rapidly than drawn OIOT fiber. Conversion of undrawn OIOT yarn by thermal cyclodehydration followed by appropriate drawing produced a PODZ having T/E/M of 4.0/10/164. Thermal half tenacity life of this unique high modulus PODZ lies between 24 and 36 hrs at 400 C. in air. A route to fiber containing the 2,5(m/p-phenylene)-1,3,4-thiadiazole structure was found. Polythiadiazole yarn exhibited excellent thermal stability. Thin films of the oxathiahydrazide also underwent facile thermal conversion. Independent syntheses of poly(phthaloyloxathiahydrazide) structures were achieved. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1964
- Accession Number
- AD0455622
Entities
People
- A. H. Frazer
- T. A. Reed
- W. P. Fitzgerald