High-strength, high-modulus fibers from hydrazide polymers and copolymers
β Scribed by Frank Dobinson; C. A. Pelezo; W. B. Black; K. R. Lea; J. H. Saunders
- Publisher
- John Wiley and Sons
- Year
- 1979
- Tongue
- English
- Weight
- 351 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0021-8995
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π SIMILAR VOLUMES
## Abstract __p__βPhenylene oxadiazole/Nβmethyl hydrazide copolymers were prepared by polymerization of terephthalic acid, dimethyl terephthalate, and hydrazine sulfate in fuming sulfuric acid, and coagulation of the polymer was obtained in aqueous sulfuric acid. Fibers spun from these copolymers h
A carbon ribbon has been produced from a polyimide film whose microstructure can be varied by the degree of restraint or stretch during pyrolysis. The microstructure was varied from a coarse lamellar structure to a welldefined lamellar structure typical of a highly ordered graphite. Increasing the d
are considerably under-estimated. This difficulty must be understood before defect structure calculations can be carried out adequately for graphite. The Morse potential yields a much larger anharmonic coefficient than is deduced from thermal expansion measurements.
Cellulose triacetate (CTA) fibers were spun from a 35% (w/v) solution of CTA (molecular weight, 95,000) in trifluoroacetic acid (TFA)/CH2CL2 (60/40, v/v) using laboratory-scale spinning equipment, an air gap, and cold MeOH as the coagulant. The resulting fibers, of large diameter (ca. 80 pm) were sa