✦ LIBER ✦

In situ electrical resistivity changes during bromine intercalation in carbon fibers

✍ Scribed by R.B. Mathur; O.P. Bahl; A. Kannan; S. Flandrois; A. Marchand; V. Gupta

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 521 KB
Volume: 34
Category: Article
ISSN: 0008-6223
DOI: 10.1016/0008-6223(96)00089-9

No coin nor oath required. For personal study only.

✦ Synopsis

In

situ reaction kinetics of bromine intercalation in carbon fibers have been followed by measuring changes in their electrical resistivity during an intercalation and de-intercalation cycle. The study suggests that for well-graphitized P-55(HTT 3000°C) and P-120 carbon fibers the reaction starts instantaneously and most of the charge transfer takes place within the first ten minutes with only 6% Br, weight uptake. It has also been shown that the threshold bromine vapor pressure lies below 26 Torr for P-120 fibers (Tpseudo _ -15°C) and 48 Torr for P-55 HT and is dependent on the structure of the host carbon fibers. The results have been compared with the earlier ex situ bromination studies on carbon fibers.

📜 SIMILAR VOLUMES

The intercalation of bromine in graphiti

The intercalation of bromine in graphitized carbon fibers and its removal

✍ J.G. Hooley; Victor R. Deitz 📂 Article 📅 1978 🏛 Elsevier Science 🌐 English ⚖ 772 KB

When the bromine residue in graphite is heated and cooled between 20" and 900°C there is an emission of Brz over certain relatively small temperature ranges on both heating and cooling. It is shown that two of these emissions are associated with observed decreases in X-ray diffraction spacing betwee

Changes in electrical resistivity and me

Changes in electrical resistivity and mechanical properties of graphite fibers after nitration

✍ F.Lincoln Vogel 📂 Article 📅 1976 🏛 Elsevier Science 🌐 English ⚖ 233 KB

Correlation of change in electrical resi

Correlation of change in electrical resistance with strain of carbon fiber-reinforced plastic in tension

✍ Mei Xuan Xu; Wen Guang Liu; Zhen Xiang Gao; Lu Peng Fang; Kang De Yao 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 343 KB

A study was carried out on the variation in the electrical resistance of carbon fiber-reinforced unsaturated polyester/polyurethane (UP/PU) IPN composites during static tension, cyclical loading, and unloading in tension. The resistance was found to vary nonlinearly with strain and increase abruptly

Electrical resistivity of fluorine-based

Electrical resistivity of fluorine-based intercalation compounds of graphite fiber in low temperature region

✍ T. Nakajima; B. Chang; T. Fujiwara; N. Watanabe; M. Endo 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 267 KB

Temperature dependence of the resistivity has been measured between 4.2 K and 273 K on C,F, C,TiF, and C,VF,. The resistivity obeys the equation, p(T) = A + BT + CT\* in the temperature range up to around 170 K and 220 K, where C,F and C,VF, exhibit anomalous inflections possibly connected with phas

Room-temperature fluorine-induced decrea

Room-temperature fluorine-induced decrease in the stability of bromine and iodine intercalated carbon fibers

✍ Ching-Cheh Hung 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English

Upon exposure to room-temperature fluorine, intercalated carbon fibers (containing either bromine alone or iodine and bromine together) become heavier and less stable. For Amoco P-100 graphitized carbon fibers, which were intercalated with 18 wt% bromine, 1 hour of fluorine exposure resulted in a la

109. Change in properties and structure

109. Change in properties and structure of carbon fibers during oxidation

✍ J.B Donnet; H Dauksch; E Papirer 📂 Article 📅 1973 🏛 Elsevier Science 🌐 English ⚖ 109 KB