COMPATIBILITY OF FRACTIONS FOR THE DEVELOPMENT OF THE LIQUID CRYSTAL STATE FROM MESOPHASE PITCH.

Mesophase pitches prepared under variable conditions were fractionated using benzene, tetrahydrofuran and pyridine. The anisotropy and shape of solidified fraction mixture at variable ratios were examined after the annealing to reveal the interaction among fractions. The anisotropic content increased sharply when (benzene insoluble) fraction was beyond the 50 wt%. The interlayer stacking of small molecules of the benzene soluble fraction among large planar molecules of BI fraction may allow the anisotropic development. The lighter fraction provides the fusibility of whole mesophase pitch by dissolving the heavier fraction.