A novel analysis for the NMR magic sandwich echo in polymers: application to the α-relaxation in polybutadiene

  • Marco Pieruccini
  • Simone Sturniolo
  • Maurizio Corti
  • Attilio Rigamonti
Regular Article

Abstract

On the basis of a method to describe the relaxation dynamics in an ensemble of spin pairs, an analytical expression is derived for the magic sandwich echo refocusing efficiency of 1H-NMR signals from systems where dipolar interaction dominates. At the sake of illustration the method is applied to the analysis of the α-relaxation in poly(butadiene). The Vogel-Fulcher-Tammann behaviour of the central relaxation rates, derived by fitting the refocusing efficiency as a function of the temperature, follows very well independent measurements performed with stimulated echo 2H-NMR experiments. Comparison with literature data worked out by broad band dielectric spectroscopy also shows very good agreement. In the framework of an Havriliak-Negami representation of the distribution of correlation times, information about width and asymmetry of the frequency profile is also provided by the analysis. This novel method is believed to represent a suitable path to extract basic information on the motional distribution in a variety of similar systems.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Marco Pieruccini
    • 1
  • Simone Sturniolo
    • 2
  • Maurizio Corti
    • 3
  • Attilio Rigamonti
    • 3
  1. 1.Istituto NanoscienzeCNRModenaItaly
  2. 2.Dept. Comp. Sci.Rutherford Appleton LabDidcotOxon, UK
  3. 3.Dipartimento di Fisica “A. Volta”Università di PaviaPaviaItaly

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