Carbon spherules, nuclear magnetic resonance (NMR), coal tar pitch, PVC pitch. Carbonization under pressure modifies the reaction process so as to give a high carbon yield and also to form a structure in the resultant solid carbon which is different from that formed under normal pressures. Marsh er
High temperature 1 H NMR study of mesophase formation
β Scribed by K. Miyazawa; T. Yokono; Y. Sanada; E. Yamada; S. Shimokawa
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 286 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
The formation of mesophase during the liquid-phase carbonization of organic materials, pitches, coals and so on, has been widely investigated by means of various techniques and apparatuses
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An autoclave-type 'H NMR probe has been developed to monitor the carbonization process of such carbonaceous materials as coal and pitch under high pressures up to 10 MPa. In the early stages of the carbonization of pitch, the change in hydrogen aromaticity, fHe, was found to be dependent on the appl
The effects of heat-treatment at lower temperature on the formation of carbonaceous mesophase were studied. Heat-treatments of QS pitch below 340Β°C and of KF asphalt below 370Β°C lead to the formation of mesophase spherules having a different structure from those found previously. For QS pitch, the l
The structural parameters of mesophase pitch with optical anisotropy have been successfully obtained by using high-temperature 13C-NMR spectroscopy. Well-resolved spectra were obtained from the mesophase pitch with the addition of pyrene, which played the role of solvent for a quinolineinsoluble ri
High-temperature heating processes for coal-tar-derived pitch (pitch A), petroleum-derived pitch (pitch B), and hydrogenated petroleum-derived pitch (pitch C) have been studied by in-situ hightemperature '"C-NMR. Mesophase formation processes have been successfully monitored for all three kinds of p