Method of producing carbon fiber and product thereof

Details Method of producing carbon fiber and product thereof Method of producing carbon fiber and product thereof

D - Textiles, Paper

01

F

18/9

D01F 9/22 (2006.01)

Patent

CA 1156409

ABSTRACT OF THE DISCLOSURE A novel process is provided for the formation of improved fibrous materials (primarily of acrylonitrile units) with increased modulus of elasticity and strength as well as decreased diameter. Preferably, the material is acrylonitrile, typically copolymerized with a minor amount of an acrylic monomer such as methyl acrylate. Oxidation of the fiber is effected at an elevated temperature in the presence of a car- boxylic acid, other than formic acid, or its anhydride within the fiber. It is believed that the acid and/or its anhydride which is formed at the oxidizing temperature serves as a plasticizer and reduces the fiber yield stress and increases fiber plasticity so that the fibers may be drawn by as much as 300% or more in the presence of the acid and/or its anhydride during oxidation, thereby providing the desired improvement in increased elasticity and strength.

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