The Preparation and General Properties of Ion-exchange Carbon Fiber

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Cation-exchange carbon fibers were prepared from pitch-based carbon fiber by oxidizing treatment with a mixture of K2Cr2O7, HNO3, and water. Their most characteristic properties were a large electric conductivity, a large thermal stability, and their shape. Their exchanging properties varied with the composition of the mixture and the treating conditions. The following composition and the conditions were adopted as standard. Composition of the mixture: K2Cr2O7, 10 g; HNO3, 20 ml; H2O, 80 ml Condition of the treatment: temperature, 104°C; period, 2.5 hr Amount of carbon fiber: carbon fiber prepared at 1000°C 1 g The cation-exchange capacity obtained by the standard procedure was 2.0±0.1 mequiv/g. Carbon fiber prepared at 1000°C was a better material than that prepared at 2000°C. Even after the exchangers were heated at 220°C in air, no change was observed in the capacity measured at room temperature. The electric resistivity increased from 7×10−3 ohm-cm to 8×102 ohm-cm with an increase in the capacity, and no difference was obserbed between exchangers of the acidic form and the sodium form. The tensile strength of the filament(1.9 mequiv/g in the capacity) was 6.7×106 g/cm2, and the breaking load of the spinning yarn of 1300 den. (2.0 mequiv./ g) was 3.0 kg.
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