Stability of the electrical resistivity of bromine, iodine monochloride, copper(II) chloride, and nickel(II) chloride intercalated pitch-based graphite fibers
✍ Scribed by James R. Gaier; Melissa E. Slabe; Nanette Shaffer
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 824 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0008-6223
No coin nor oath required. For personal study only.
✦ Synopsis
Four different grades of pitch-based graphite fibers (Amoco P-55, P-75, P-100, and P-120) were intercalated with each of four different intercalates: bromide (Br,), iodine monochloride (ICI), copper(I1) chloride (CuCI,), and nickel(H) chloride (Nit&). The P-55 fibers did not react with Br? or Nit&, and the P-75 did not react with Nit&. The stability of the electrical resistance of the intercalated fibers was monitored over long periods of time in ambient, high humidity (100% at @.K), vacuum (10e6Torr), and high temperature (up to 400°C) conditions. It was found that fibers with lower graphitization form graphite intercalation compounds (GICs) that are more stable than those with higher graphitization (i.e., P-55 (most stable) > P-75 > P-100 > P-120 (least stable)). Br, formed the most stable GICs followed in order of decreasing stability by ICI, CuCI,, and Nit&. Although Br2 GIG's had the best stability, ICI had the advantages of forming GICs with slightly greater reduction in resistance (by about 10%) than Br,, and the ability to intercalate P-55 fiber. The transition metal chlorides appear to be seriously susceptible to water vapor and high temperature.
Key Woos-Graphite fibers, intercalation, bromine, iodine monocloride, copper chloride, nickel chloride.