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Enhancement of the reactivity to air of polyacrylonitrile-based carbon fiber cloth has been achieved by the addition of metals to the cloth.Prior to metal addition, the cloth was oxidized in 54 wt% nitric acid in order, both, to increase the surface area of the cloth and to add carboxyl groups to the surface.Metal addition was then achieved by soaking the cloth in metal acetate solution to effect exchange between the metal cation and hydrogen on the carboxyl groups.The addition of potassium, sodium, calcium, and barium enhanced fiber cloth reactivity to air at 573 K.Extended studies using potassium addition showed that success in enhancing fiber cloth reactivity to air depends on: extent of cloth oxidation in nitric acid, time of exchange in potassium acetate solution, and the thoroughness of removing metal acetate from the fiber pore structure following exchange.With increased potassium loading on fiber cloth which has undergone a fixed extent of prior oxidation, cloth reactivity in air reaches a maximum and in some cases decreases.Optimum loading is associated with potassium added by exchange;additional loading is associated with potassium added by decomposition of acetate not removed from the fiber pore system by washing.Cloth reactivity increases essentially linearly with increase in potassium addition via exchange.

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