| 摘要 |
PROBLEM TO BE SOLVED: To provide an acrylonitrile-based polymer suitable for a raw material for a carbon material such as carbon fiber, and having stable thermal oxidation reactivity. SOLUTION: This acrylonitrile-based polymer has the inverse number 1/tp of an exothermic peak appearance time tp (min) in an isothermal exothermic curve measured by a heat flux-type differential scanning calorimeter in an air flow of 100 ml/min at 230 deg.C, satisfying the relation of 0.1<1/tp<2.0. The polymer is preferably produced by using a dibasic acid salt of 2,2'-azobis(2- aminodipropane) as an initiator by a water-based suspension polymerization method. |
