Polyacrylonitrile (PAN) Terpolymers Containing Neutral and Acidic Comonomers for PAN Carbon Fiber Precursor
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Carbon fiber is manufactured by heating and carbonizing organic fiber under inert gas and it has excellent specific strength, elastic modulus, thermal and chemical resistance. Due to those advantages, carbon fiber has been extensively applied in high-tech fields such as aerospace, defense areas, and civil engineering as reinforcing material. However, PAN homopolymer has hardly been used because of its high stabilization temperature, centralized heat release and poor solubility. Moreover, PAN carbon fibers are highly affected by chemical structure of comonomer, and its content. In this study, poly(acrylonitrile-co-methyl acrylate-co-itaconic acid) or poly(acrylonitrile-co-methyl acrylate-co-acrylic acid) containing different contents of comonomers were synthesized using solution polymerization. The characteristics of PAN terpolymers with different weigh ratio of comonomers were characterized by NMR, FT-IR, DSC, Ubbelohde viscometer and Rotational viscometer.