Abstract
On the laboratory scale, mesophase samples were prepared from coal tar pitch by pyrolysis in the bulk phase and from pyrolysis oil by feeding into a reactor. From texture analysis by SEM, it was shown that in the former case the mesophase consists of isolated blocks in which the unidirectionally arranged lamellar formations are contiguous to one another unconformably, thus forming a mosaic structure. In the latter case the mesophase grows layer by layer, the lamellar formations being contiguous to one another conformably to give a mesophase with domain and flow structure. Common systematic features were found in the two types of mesophase: the orientation of lamellae perpendicular to the surface, lamellar packets of 0.1 μm thickness, and the angle of their transverse fracture, 104 °.
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