Formation of Mesophase in Fractionated Pitches under Pressure

Abstract

The behavior of mesophase formation at 480 and 500°C under a pressure of 30 MPa was studied on the fractionated pitches with different molecular weights, and compared with that of the original pitch. The formation of mesophase spheres was in a quite different way in each fractionated pitch; the fraction with high molecular weight resulted in a small number of large spheres, some of which were coalesced, and high concentration of small spheres was found in the fraction with low molecular weight.