Synthesis of PAN-based Carbon Fiber Precursor Including Methyl Acrylate (MA) and Itaconic Acid (IA) or Acrylic Acid(AA) via Aqueous Suspension Polymerization
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PAN-based carbon fibers dominate the market due to their excellent strength, modulus properties and high toughness. Owing to those desirable properties, PAN-based carbon fibers have been used in the automobile, energy industries and aerospace. PAN homopolymers have centralized and sudden heat release during the thermal oxidative stabilization step. As a result, volatiole side-products are produced, which damage the properties of carbon fibers. To overcome the defect, various of co- or terpolymers are commonly used as the PAN-based carbon fiber precursor. Due to these characteristics, it is more commonly used as copolymers than homopolymers. In this work, poly(acrylonitrile-co-methyl acrylate-co-itaconic acid) and poly(acrylonitrile-co-methyl acrylate-co-acrylic acid were synthesized with different ratios of comonomer using aqueous suspension polymerization. The properties of PAN-based terpolymers were analyzed by using NMR, FT-IR spectroscopy, DSC, XRD, GPC and ubbelohde viscometer.