VARIATION OF THE PHYSICOCHEMICAL PROPERTI ES OF CARBON-FIBERS DURING BROMINATION

Pitch-based carbon fibers brominated for different time periods were i nvestigated. Their electrical conductivity was measured; IR spectra an d Raman spectra were recorded; fibers brominated for different periods of time (up to 144 h) were also studied gravimetrically. The whole bo dy of data was treated from the viewpoint of structural changes that t ake place in the fiber during the bromination. These changes involve t he destruction of the graphite structure, growth of the content of the amorphous phase, and an increase in the number of graphite layers adj acent to bromine.