ISSN:
0449-2951
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
A polyoxidiazole fiber, alt. poly[1,3-/1,4-phenylene-2,5-(1,3,4-oxadiazole)], with excellent thermal stability was prepared from poly(isophthalic-terephthalic hydrazide) fiber by thermal cyclodehydration. Conversion of this polyhydrazide fiber proceeded at 280°C. in a muffle furance under positive nitrogen pressure and was completed in 48-72 hr., as evidenced by elemental analyses. The resulting polyoxadiazole fiber had the following typical fiber properties: T/E/Mi/den. = 2.6/3.1/124/3.1. It was thermally stable when exposed for prolonged periods of time at temperatures of 400°C. During heat treatment between 300 and 400°C. the initial polyoxadiazole fiber undergoes a structural change and final properties were: T/E/Mi/den. ∼ 1.5/1.5/90/3.0. The polyoxadiazole structure was found to degrade severely at 450°C.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pol.1964.100020314
