| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a novel polyimide, a polyimide fiber, and methods for producing them, more specifically; a polyimide which is soluble in a solvent and has heat resistance; a high-performance polyimide fiber using this solvent-soluble polyimide, in particular, a heat-resistant polyimide fiber; and methods for producing them. <P>SOLUTION: The polyimide includes a polyimide structure unit in which tetracarboxylic acid di-anhydride is added to the amino groups of both terminals of bis(aminophenoxy)biphenyl. The polyimide is produced, for example, by a method which includes; a first polymerization process in which tetracarboxylic acid di-anhydride reacts with bis(aminophenoxy)biphenyl at a molar ratio of 2:1 to prepare an imide oligomer in which the tetracarboxylic acid di-anhydride is added to the amino groups of both terminals of the bis(aminophenoxy)biphenyl; and a second polymerization process in which the imide oligomer reacts with tetracarboxylic acid di-anhydride and diamine to prepare an imide polymer. The polyimide fiber contains the polyimide. <P>COPYRIGHT: (C)2013,JPO&INPIT |
