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.
22. High strength, high-modulus graphite fibers: a review (Plenary Lecture)
β Scribed by H.M Ezekiel
- Publisher
- Elsevier Science
- Year
- 1969
- Tongue
- English
- Weight
- 112 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0008-6223
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The elastic modulus of a nuclear graphite was measured in the range from room temperature to 1400Β°C by the ultrasonic pulse echo method. Little or no change in the elastic modulus was observed up to 450Β°C. Above XWC, however, it increased almost linearly with increasing temperature. The fractional i
## 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