INTERACTION BETWEEN PITCH AND PHENOL RESIN DURING PRESSURE CARBONIZATION

Mixtures of a benzene-soluble part in pitch (BS-pitch) and a phenol resin powder were carbonized under pressure, and the textures of the resultant carbons were characterized by polarized-light microscopy. Under the pressure of 30 MPa, the carbon with a homogeneous texture was obtained; the size of mosaic unit decreasing with the increase of phenol resin content. Fine mosaic texture was found in 40-50 wt% phenol resin content. Below 7 MPa, however, the carbons formed from the phenol resin and from the BS-pitch were clearly distinguished. The low molecular weight components in the pitch or pyrolysed products from the pitch were found to play an important role for the interaction of both precursors during pressure carbonization to be resulted in the carbon with homogeneous texture. © 1990.