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Spin-trapping artifacts on addition of polyacrylonitrile and poly(methyl methacrylate) to dimethyl sulphoxide.

Cheetham, P. F. and Cutting, G. R. and Tabner, B. J. (1992) Spin-trapping artifacts on addition of polyacrylonitrile and poly(methyl methacrylate) to dimethyl sulphoxide. Magnetic Resonance in Chemistry, 30 (7). pp. 626-631.

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Abstract

An ESR spectrum is observed when a sample of polyacrylonitrile powder is dissolved in a dimethyl sulphoxide solution of nitrosobenzene at room temperature. However, the spectrum is not associated with the trapping of occluded radicals from within the polymer latex, but with the hydrogen atom adduct. [Similarly, when an aqueous emulsion of poly(methyl methacrylate) is added in place of the polyacrylonitrile powder the spectrum of the hydrogen atom adduct is again observed.] Experiments in dimethyl-d6 sulphoxide indicate that the hydrogen atom does not originate from the solvent. At higher temperatures (383 K) the spectrum of a mixture of the hydrogen atom and methyl radical adducts is observed. Experiments in dimethyl-d6 sulphoxide show that the latter radical originates from the solvent.

Item Type: Article
Journal or Publication Title: Magnetic Resonance in Chemistry
Uncontrolled Keywords: ESR • Spin Trapping • Occluded radicals • Polyacrylonitrile
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22747
Deposited By: ep_ss_importer
Deposited On: 13 Jan 2009 10:16
Refereed?: No
Published?: Published
Last Modified: 26 Jul 2012 16:05
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22747

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