The direct measurements of the principal thermal expansion coefficients were carried out for the specimens of pyrolytic graphite at temperatures between 50 and 55O"C, using an apparatus with high sensitivity. Resolving power of the apparatus was f 100 A. The c-axis thermal expansion coefficient was
220. Developing of techniques for characterizing pitch chemistry
β Scribed by W.G. Bradshaw; J.G. Moncur
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 128 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
Materials Engineering Department, Rensselaer Polytechnic Institute, Troy, NY 12181, U.S.A.).
Mass spectra of the species evolved during flash pyrolysis of pitches will be presented. Distinct differences in mass spectra were noted for the different feedstocks. Limitations of the technique will be discussed. For the toluene insolubles of A-240 pitch, significant quantities of naphthalene and anthracene and their methyl monosubstituted variants were observed.
Studies on pitch pyrolysis by combined thermogravimetric and gaschromatographic analysis
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A new proton n.m.r. technique has been developed for the chemical characterization of polymerized petroleum pitches with pyridine-insoluble contents as high as 80%. The polymerized pitches were completely solubilized for conventional 1 H n.m.r. evaluation in a mixed solvent system consisting of S$&-