Infrared spectroscopic study of the structural change of polymethacrylonitrile following heat-treatment and subsequent treatment with water

✍ Scribed by Akira Nagata; Koji Ohta; Reikichi Iwamoto

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 577 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970615

✦ Synopsis

Abstract

The infrared spectrum of polymethacrylonitrile (PMAN) exhibits noticeable change on heat‐treatment up to 240°C, the color of the sample changed from yellowish at 120°C, through yellow and red, to deep red at 210°C or above. A new structure
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was proposed as a plausible structure for the chromophore of the heat‐treated PMAN film, on the basis of comprehensive consideration of details of the spectral change in reference to the corresponding spectral change of polyacrylonitrile (PAN) and the spectra of compounds having similar structures. Subsequent treatment of the deep‐red PMAN with hot water further drastically changed the infrared spectrum, and in turn the color changed from deep red to yellowish. The spectrum of the hydrolyzed product was in complete agreement with that of the copolymer of methacrylonitrile and methacrylic acid. Thus the structure was found to be
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from infrared spectral comparison.