Effects of graphitization on the environmental stability of brominated pitch-based fibers

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6947557

Gaier, J R; Slabe, M E

The residual bromine graphite intercalation compounds of high modulus pitch-based fibers (Amoco P-55, P-75, P-100, and P-120) were formed and their resistances were monitored under a variety of environmental conditions. A threshold graphitization was observed below which the bromination reaction does not occur to an appreciable extent. The graphitization of the P-55 fibers falls below that threshold, precluding an extensive reaction. The P-75, P-100, and P-120 fibers all form bromination compounds which are stable at ambient conditions, under vacuum, and under high humidity (100 percent humidity at 60 C). The thermal stability of the resistivity increased with decreasing graphitization, with the stable temperature for P-120 being 100 C; for P-100, 200 C; and for P-75, 250 C. When cost is a consideration, bromination of pitch-based fibers is an economical way to achieve low resistivities.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 6947557
• Report Number(s): N-87-12679; NASA-TM-88899; E-3323; NAS-1.15:88899; CONF-861207-60
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BROMINATION
CARBON FIBERS
CHEMICAL REACTIONS
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
FIBERS
GRAPHITIZATION
HALOGENATION
INFORMATION
NUMERICAL DATA
PHYSICAL PROPERTIES
TEMPERATURE EFFECTS