| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polyphenylene sulfone fiber having high heat resistance and high proton exchange capacity. Ž<P>SOLUTION: The polyphenylene sulfone fiber is produced by circulating a liquid current while dropping an oxidant such as hydrogen peroxide while keeping a state of a polyphenylene sulfide fiber soaked in a solvent obtained by adding a sulfuric acid catalyst to a carboxylic acid to advance the reaction. As a result, the sulfonic acid group is bonded to the phenyl group of the phenylene sulfone structure to form a crosslinked structure of the phenyl groups to each other. The sulfonic acid group is left after alkali treatment. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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