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ABSTRACT Intimate relationship between the thermal behavior and the structural change has been clarified for the first time by an organized combination of isothermal DSC thermogram and FT/IR

spectra measured for the stabilization reaction of an acrylonitrile (AN)/methacrylic acid (MAA) copolymer. In an early stage of the isothermal exothermic thermogram measured by DSC under

air, a flat region or the induction period of the cyclic structure formation was found to exist, which is immediately followed by the two stages of steep heat evolution and the slow heat

release. Based on the IR spectral changes observed during this thermal reaction, the induction stage was found to be associated with the reaction of methacrylic acid groups with the adjacent

nitrile groups and the steep heat evolution region with the propagation of the cyclic structure and dehydrogenation of the polyacrylonitrile (PAN) chain sequences to give an unsaturated

ladder structure. An activation energy for this initiation reaction of the cyclic structure formation was evaluated to be _ca._ 26 kcal/mol by an Arrhenius plot. SIMILAR CONTENT BEING VIEWED

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Laboratories, Mitsubishi Rayon Co., Ltd., Hideto Kakida * Department of Macromolecular Science, Faculty of Science, Osaka University, Kohji Tashiro & Masamichi Kobayashi Authors * Hideto

Kakida View author publications You can also search for this author inPubMed Google Scholar * Kohji Tashiro View author publications You can also search for this author inPubMed Google

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THIS ARTICLE Kakida, H., Tashiro, K. & Kobayashi, M. Mechanism and Kinetics of Stabilization Reaction of Polyacrylonitrile and Related Copolymers I. Relationship between Isothermal DSC

Thermogram and FT/IR Spectral Change of an Acrylonitrile/Methacrylic Acid Copolymer. _Polym J_ 28, 30–34 (1996). https://doi.org/10.1295/polymj.28.30 Download citation * Issue Date: 01

January 1996 * DOI: https://doi.org/10.1295/polymj.28.30 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a shareable

link is not currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing initiative KEYWORDS * Polyacrylonitrile * Methacrylic Acid * DSC

* FT/IR * Precursor * Carbon Fiber * Stabilization * Induction Period