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Initiation process of radiation-induced ionic polymerization as studied by electron spin resonance

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Fortschritte der Hochpolymeren-Forschung

Part of the book series: Advances in Polymer Science ((POLYMER,volume 6/3))

Abstract

Ionic processes of monomers, nitroethylene, n-butylvinylether and styrene, in organic glass matrices of 2-methyltetrahydrofuran, 3-methylpentane and n-butylchloride irradiated by γ-rays at 77° K, are studied by observing the electron spin resonance spectra of trapped electrons and ion radicals formed from the solute monomers. The primary ionic intermediates are the trapped electrons and their counterpart, cation radicals of matrix molecules. However, in 2-methyltetrahydrofuran glass, the anionic processes of solute monomers resulting from the trapped electrons proceed selectively. On the contrary, only the cationic processes proceed selectively in n-butylchloride glass. Both processes are able to occur in 3-methylpentane glass.

The formation of ion radicals from monomers by charge transfer from the matrices is clearly evidenced by the observed spectra: nitroethylene anion radicals in 2-methyltetrahydrofuran, n-butylvinylether cation radicals in 3-methylpentane and styrene anion radicals and cation radicals in 2-methyltetrahydrofuran and n-butylchloride, respectively. Such a nature of monomers agrees well with their behavior in radiation-induced ionic polymerization, anionic or cationic. These observations suggest that the ion radicals of monomers play an important role in the initiation process of radiation-induced ionic polymerization, being precursors of the propagating carbanion or carbonium ion. On the basis of the above electron spin resonance studies, the initiation process is discussed briefly.

The contents in this article were presented at the first Kyoto polymer seminar held in November 1967 in Kyoto, Japan

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Authors and Affiliations

  1. Research Reactor Institute, Kyoto University, Osaka

    H. Yoshida & K. Hayashi

  2. Department of Engineering, Hokkaido University, Sapporo, Japan

    H. Yoshida & K. Hayashi

Authors
  1. H. Yoshida
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  2. K. Hayashi
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© 1969 Springer-Verlag

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Yoshida, H., Hayashi, K. (1969). Initiation process of radiation-induced ionic polymerization as studied by electron spin resonance. In: Fortschritte der Hochpolymeren-Forschung. Advances in Polymer Science, vol 6/3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0101445

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  • DOI: https://doi.org/10.1007/BFb0101445

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-04399-7

  • Online ISBN: 978-3-540-35946-3

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