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BIODEGRADATION OF PITCH-BASED CARBON FIBER (GRAPHITE FIBER) BY MICROORGANISMS By Takashi Watanabe Faculty of Education, Yamaguchi University.1677-1 Yoshida, Yamaguchi, 753 Japan ABSTRACT: Biodegradation of pitch-based isotropic graphite fibers, made by heat-treatment at 2000 °C, by microorganisms was studied. Microbe strains ((spervillus flavus and. lapergillus sr jae) were incubated on Czapek agar slant medium, deficient of carbon source, at 30 °C in the presence of graphite fibers. The biodegraded fiber was examined by scanning electron microscopy. Breaking area on the surface of the fi her (length in the direction of fiber axis, 24 hem) was biodegraded for 30 days by .1. flavus. An adhesive matter at the breaking area on the surface of the biodegraded fiber was observed. The degree of biodegradation of the fiber was evaluated from the length of the biodegraded area along the fiber axis. The minimum area of biodegradation in the initial stage of degradation was 2 pm in length or smaller. Biodegrada tion of the fiber began at the point of random orientation of graphite structure on the surface layer of the fiber, progressed to the enlargement in volume of the restricted area in the layer and to the breaking of the restricted area. The central part of the fiber did not seem to be biodegraded, because no fiber was observed to have been completely degraded. A term of "pinhole degradation" was proposed for this type of degradation of pitch-based isotropic graphite fiber by microorganisms. (Received August 2, 1990)

Studies on microbiological deterioration of textile. (Part 5). Biodegradation of pitch-based carbon fiber (graphite fiber) by microorganisms.