| 摘要 |
PROBLEM TO BE SOLVED: To industrially provide a polybenzazole fiber which retains excellent strength and heat resistance inherent in a polybenzazole fiber, has a reduced amount of the acid solvent remaining in the fiber, exhibits only a small amount of strength reduction under a high temperature and high humidity condition, and is improved in durability. SOLUTION: In the copolymerized polybenzazole fiber, repeating units expressed by general formulas (1) and (2) are random- or block-copolymerized in the molecular chain. The apparent crystal size on the (200) plane perpendicular to the axis of the fiber is≤49Å. In the formulas, n is a real number in the range of 0.01≤n≤0.99; X is an S or an O atom or an NH group; Z is a C-H group or an N atom; the N atom and the X atom/group in the azole ring may be in the trans position or the cis position. COPYRIGHT: (C)2006,JPO&NCIPI
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