Infrared spectroscopy polyacrylonitrile

The degradation of the cellulose fraction of the copolymer and subsequent recovery of the polyvinyl polymer have often been used to characterize the polymer. For example, cellulose may be acetylated and acid hydrolyzed to remove it from the copolymer. Then the recovered polymer can be dissolved, in solvent normally used for the polymer, and i the molecular weight of the polymer determined viscometrically (12, 42). As reported previously for polymers, such as polyacrylonitrile, a functional group on the polymer may be altered during the fractionating. These changes have been determined by infrared spectroscopy. For free-... 

Usami, T., Itih, T., Ohtani, H., Tsuge, S. (1990) Structural study of polyacrylonitrile libers during oxidative thermal degradation by pyrolysis-gas chromatography, solid state 13C Nuclear magnetic resonance and Fourier transform infrared spectroscopy, Macromolecules 23, 2460-2465. 

Figure 12.39 Series of transmission FTIR spectra for (a) Nikkoso precursor AN/MA/ITA, (b) Oxidized in air for 20 min 215°C/15 min 235°C, (c) Oxidized in air for 20 min 215°C/180 min 235°C, (d) Oxidized in air for 20 min 215°C/1800 min 235°C. Source Reprinted from UsamlT, ItohT, Ohtani H.Tsuge S, Structural study of polyacrylonitrile fibers during oxidative thermal degradation by Pyrolysis— Gas Chromatography, Solid State C Nuclear Magnetic Resonance and Fourier Transform Infrared Spectroscopy, Macromolecules, 23, 2460-2465, 1990.

Zhu Y, Wilding MA, Mukhopadhyay SK, Estimation, using infrared spectroscopy, of the cyclization of polyacrylonitrile during the stabilization stage of carbon fibre production, J Mater... 

Usami T, Itoh T, Ohtani H, Tsuge S, Structural study of polyacrylonitrile fibers during oxidative thermal degradation by Pyrolysis—Gas Chromatography, Sohd State C Nuclear Magnetic Resonance and Fourier Transform Infrared Spectroscopy, Macromolecules, 23, 2460 2465, 1990. 

Scanning electrochemical microscopy (SECM) has been applied to polymethylmethacrylate, polystyrene and polyethylene glycol. Surface enhanced infrared reflection microscopy was applied to polyacrylonitrile, polybutadiene and styrene resins whilst Fourier transform infrared spectroscopy was applied to polyimides. Finally, nuclear magnetic resonance spectroscopy has been applied to the examination of the surfaces of films of polyethylene, Suryln and ethylene-vinyl acetate copolymer. ... 

I. Matsubara, Detection of End Groups in Polyacrylonitrile by Differential Infrared Spectroscopy, Bull. Chem. Soc. Japan 33,1624-1626,1960. 

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