Pai, BC and Parameswara, MA and Sridhar, MK and Kanakalatha, P (1983) Mesophase formation in pitches - A metallographic study. Technical Report. National Aeronautical Laboratory, Bangalore, India.
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Abstract
Anisotropic mesophase formation in coal tar and petroleum pitch as a result of thermal polymerisation were studied using optical polarized light microscopy. Mesophase in the coal tar was formed when heated to above 420xB0;C. Removal of low molecular. weight hydrocarbons of the order of 24.wt%13; and above was found to be essential for the formation of 13; mesophase. Initial removal of about 20 wt% low molecular13; weight .hydrocarbons at 390xB0;C and then heating to 420xB0;C and13; above resulted in quot;larger clusters of mesophase. How ever,13; heating to 420xB0;C and abovedirectly gave fine dispersions13; of the mesophase. Free carbon, added anisotropic graphite13; particles and any other inclusions can be seperately identified from using optical polarized light microscopy.
| Item Type: | Proj.Doc/Technical Report (Technical Report) |
|---|---|
| Uncontrolled Keywords: | Anisotropic mesophase;Petroleum pitch;Polymerisation;Molecular. weight;Anisotropic graphite |
| Subjects: | CHEMISTRY AND MATERIALS > Inorganic, Organic and Physical Chemistry |
| Division/Department: | Materials Science Division, Materials Science Division, Materials Science Division, Materials Science Division |
| Depositing User: | M/S ICAST NAL |
| Date Deposited: | 07 Nov 2006 |
| Last Modified: | 24 May 2010 09:52 |
| URI: | http://nal-ir.nal.res.in/id/eprint/3188 |
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