Mesophase formation in pitches - A metallographic study

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.

[img] PDF
tr_pd_tm_mt_4_83_txt.pdf
Restricted to Repository staff only

Download (9MB)

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: Monograph (Technical Report)
Uncontrolled Keywords: Anisotropic mesophase;Petroleum pitch;Polymerisation;Molecular. weight;Anisotropic graphite
Subjects: CHEMISTRY AND MATERIALS > Inorganic, Organic and Physical Chemistry
Depositing User: Users 90 not found.
Date Deposited: 07 Nov 2006
Last Modified: 24 May 2010 04:22
URI: http://nal-ir.nal.res.in/id/eprint/3188

Actions (login required)

View Item View Item