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$&-
214. H NMR technique for characterization of polymeric pitches
β Scribed by R.A. Greinke
- Publisher
- Elsevier Science
- Year
- 1984
- Tongue
- English
- Weight
- 124 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
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 also directly measured for the specimens of kish graphite flakes.
Thermal diffusivity of fiber reinforced composites using the laser flash technique
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## 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 b
The pyrolysis of a number of coal tar and petroleum pitches was studied by means of thermogravimetry, derivative thermogravimetry and differential thermal analysis (DTA). Acenapthylene was used as a model compound to interpret the results of pitch pyrolysis. DTA exo-and endothermal peaks were assign
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