On Coloration of Polyacrylonitrile: A Nuclear Magnetic Resonance Study

Verneker, VR Pai and Shahat, B (1986) On Coloration of Polyacrylonitrile: A Nuclear Magnetic Resonance Study. In: Macromolecules, 19 (7). 1851 -1856.

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Abstract

Coloration in polyacrylonitrile can be induced in three distinct ways: by heat treatment, by treatment with base, or during synthesis of the polymer itself using ionic initiators at relatively higher temperatures. The present investigation employing 'H and NMR spectroscopy has revealed some common features in colored polyacrylonitrile irrespective of ita mode of coloration. All colored polyacrylonitriles give an additional peak around S 2.7 in 'H NMR spectra and, except for heat-treated polyacrylonitrile, one extra group of peaks in the region 8 12-16 in 13C NMR spectra. The former peak has been attributed to methine and/or methylene protons in branched and/or cyclized structures, while the latter peak has been attributed to methylene carbon atoms in the branched structure. Colorless polyacrylonitriles have been found to be predominantly heterotactic, while colored polyacrylonitriles have been found to have appreciable isotactic contribution.

Item Type:	Journal Article
Publication:	Macromolecules
Publisher:	American Chemical Society
Additional Information:	Copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	03 Feb 2010 07:07
Last Modified:	19 Sep 2010 05:35
URI:	http://eprints.iisc.ac.in/id/eprint/21091

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