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Magnetic Relaxation in Polymers. The Rotating Frame Method

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Natural and Synthetic High Polymers

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Abstract

The measurement of magnetic relaxation times in polymers is discussed, with particular reference to the rotating frame method for obtaining T1ρ. The relevant theory of magnetic relaxation is introduced, such as is necessary to derive parameters relating to molecular motions and phase changes from T1 and T1ρ measurements on polymers, i.e. correlation times, τ c , and activation energies, ΔE. The various approximations involved in this theory are also mentioned as are the resulting adaptations of the theory which make it more appropriate to the interpretation of data on polymers. Experimental techniques are briefly discussed and some approximate confidence limits are given for the successful graphical decomposition of non-exponential decays of magnetisation according to a two-phase model (i.e. a polymer containing amorphous and crystalline regions).

The applications of these techniques is illustrated by data on a variety of polymers, although the bulk of the discussion concerns a typical amorphous polymer, atactic polystyrene and a crystalline polymer, polyethylene oxide. A number of results are quoted which seem to indicate that phenyl group rotations or oscillations are not an important mechanism in the relaxation of polystyrene. Other materials mentioned are polypropylene oxide, starch and ionized copolymers of ethylene and methacrylic acid (ionomers). It appears that crystalline polymers invariably show non-exponential magnetisation decays in T1ρ measurements and that spin-diffusion is an important mechanism influencing relaxation behaviour in such systems, and also in polymers containing end-groups capable of rotation. A brief mention is made of some recent studies of mechanically induced anisotropy of polymers by magnetic resonance methods.

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Authors and Affiliations

  1. National Physical Laboratory, Teddington, Middlesex, England

    T. M. Connor

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  1. T. M. Connor
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Editors and Affiliations

  1. Physikalisches Institut, Universität Basel, Germany

    P. Diehl

  2. Institut für Anorganische Chemie, Universität Stuttgart, Germany

    E. Fluck

  3. Institut für Physikalische Chemie, Rhein.-Westf. Technischen Hochschule Aachen, Germany

    R. Kosfeld

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© 1971 Springer-Verlag Berlin Heidelberg

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Connor, T.M. (1971). Magnetic Relaxation in Polymers. The Rotating Frame Method. In: Diehl, P., Fluck, E., Kosfeld, R. (eds) Natural and Synthetic High Polymers. NMR Basic Principles and Progress / NMR Grundlagen und Fortschritte, vol 4. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-65089-5_14

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  • DOI: https://doi.org/10.1007/978-3-642-65089-5_14

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-65091-8

  • Online ISBN: 978-3-642-65089-5

  • eBook Packages: Springer Book Archive

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