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Effects of graphitization on the environmental stability of brominated pitch-based fibersThe 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.
Document ID
19870003246
Document Type
Conference Paper
Authors
Gaier, J. R. (NASA Lewis Research Center Cleveland, OH, United States)
Slabe, M. E. (Cleveland State Univ. Ohio, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1986
Subject Category
NONMETALLIC MATERIALS
Report/Patent Number
NAS 1.15:88899
E-3323
NASA-TM-88899
Funding Number(s)
PROJECT: RTOP 505-90-28
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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