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Identification of ESR Spectra of Mechanically Formed Free Radicals

  • Conference paper
Polymer Fracture

Part of the book series: Polymers ((POLYMERS,volume 2))

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Abstract

The action of axial tensile forces on a molecular bond R1–R2 results in a decrease of the apparent binding energy of the bond and thus in an increase of the probability for bond scission. If the reduction of the apparent binding energy is sizeable the mechanical action may be considered as the main cause of chain destruction. In as much as the scission of a chain molecule into organic radicals and the resulting appearance of unpaired free electrons is governed by mechanical forces a study of radical formation and of radical reactions will reveal information on the forces acting on a chain at a molecular level. The method of investigating free radicals by paramagnetic resonance techniques has been highly developed during the last thirty years [1,2]. Since then it was successfully applied to elucidate the mechanism of the formation of free radicals in chemical reactions and under irradiation of visible and ultraviolet light, of x- and 7-rays, and of particles [1.3]. Also the value of the spectroscopic splitting factor g, the magnetic surrounding of the unpaired free electron spin, and the structure of the free radical have been studied. In all these cases the free electron spin acts as a probe, which, at least temporarily, is attached to a certain molecule, takes part in the motion of the molecule, and interacts with the surrounding magnetic field.

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  1. Laboratoire de Polymères, Département des Matériaux, École Polytechnique Fédérale de Laussanne, Suisse

    Professor Dr. rer. nat. Hans-Henning Kausch-Blecken von Schmeling

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  1. Professor Dr. rer. nat. Hans-Henning Kausch-Blecken von Schmeling
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© 1987 Springer-Verlag Berlin Heidelberg

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von Schmeling, HH.KB. (1987). Identification of ESR Spectra of Mechanically Formed Free Radicals. In: Polymer Fracture. Polymers, vol 2. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-69628-2_6

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  • DOI: https://doi.org/10.1007/978-3-642-69628-2_6

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-69630-5

  • Online ISBN: 978-3-642-69628-2

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