Acid treatment of polyacrylonitrile tows with subsequent high-temperature washing
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-- A method has been proposed for combined short-term acid treatment of polyacrylonitrile tow with a sulfuric acid solution of elevated concentration. Intensification of the process of acid diffusion is achieved by subsequent high-temperature washing.
-- The process of combined acid treatment and washing of fibre has been studied in which washing begins before completion of acid diffusion to the tow axis. It has been shown that in acid treatment during the course of the reduced time of 0.4 · 104 sec/cm2 (which corresponds to 0.5–2 sec) and subsequent washing with water having a temperature of 50–60°C, complete acid treatment of the tow is achieved.
KeywordsPolymer Sulfuric Acid Acid Solution Acid Treatment Elevated Concentration
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