POLYAZOLE FIBER AND METHOD FOR PRODUCING SAME

摘要

Disclosed is a fiber made of an aromatic polyazole which has high molecular weight while being excellent in mechanical characteristics such as elastic modulus and strength. Also disclosed is a method for producing such a fiber. Specifically disclosed is a fiber made of a polyazole which contains a repeating unit represented by the formula (I) below and has a phosphorus content of not more than 30 ppm. Also specifically disclosed is a method for producing such a fiber. In the formula (I), Ar<SUP>1</SUP> represents a divalent aromatic group having 4-20 carbon atoms, Ar<SUP>2</SUP> represents a tetravalent aromatic group having 4-20 carbon atoms, and X represents O, S or NH.