CPC C08F 220/46 (2013.01) [C01B 32/05 (2017.08); D01F 9/22 (2013.01); C08F 2800/10 (2013.01)] | 10 Claims |
1. A method of preparing an acrylonitrile-based copolymer for a carbon fiber, the method comprising:
preparing a reaction solution including a monomer mixture and an organic solvent, wherein the monomer mixture comprises a sulfonate-based monomer represented by Chemical Formula 1, a carboxylic acid-based monomer, and an acrylonitrile-based monomer; and
subjecting the reaction solution to polymerization,
wherein the polymerization comprises:
primary polymerization of the reaction solution at a first temperature; and
secondary polymerization of the reaction solution at a second temperature higher than the first temperature,
wherein the monomer mixture comprises 0.55 to 1.6 mol % of the sulfonate-based monomer represented by Chemical Formula 1 based on a total molar amount of the monomer mixture:
![]() wherein, in Chemical Formula 1,
R is hydrogen or a C1 to C3 linear alkyl group,
L is a C1 to C3 linear alkylene group, and
X is an alkali metal.
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