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Mesophase formation in pitches - A metallographic study

BC Pai, MA Parameswara, MK Sridhar, P Kanakalatha

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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.

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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.

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Available 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.

Key concepts: Mesophase, Polarized light microscopy, Optical microscope, Materials science, Microscopy, Polymerization, Carbon fibers, Mineralogy

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