Modification of polyacrylonitrile precursors for carbon fiber via copolymerization of acrylonitrile with ammonium itaconate

Authors

  • Jian-Junn Liu,

    Corresponding author
    1. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, College of Materials Science and Engineering, Shandong University, Jinan 250061, China
    • Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, College of Materials Science and Engineering, Shandong University, Jinan 250061, China
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  • Heyi Ge,

    1. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, College of Materials Science and Engineering, Shandong University, Jinan 250061, China
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  • Cheng-Guo Wang

    1. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, College of Materials Science and Engineering, Shandong University, Jinan 250061, China
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Abstract

Ammonium-modified polyacrylonitrile was prepared by free-radical solution copolymerization of acrylonitrile (AN) with ammonium itaconate (AIA), and then it was spun into precursor fibers in this study. Effects of AIA and itaconic acid on the characteristics of the copolymers and precursor fibers were studied in contrast. It has been found that the ammonium modification could obviously increase the hydrophilicity of the copolymer. And in the spinning processes, modified copolymer can withstand higher total draw-ratio of 12.6 folds, while unmodified copolymer only 8.5 folds. The void volume, fineness, tenacity, and elongation at-break of the ammonium-modified precursors are all improved and enhanced. WAXD test manifested that the modified precursors had higher degree of orientation. DSC test showed that the thermal properties of the modified and unmodified precursor fibers were almost the same. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 102: 2175–2179, 2006

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