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Molecular Place Changes and Mechanical Damping Spectra

  • Günther Hartwig
Chapter
Part of the The International Cryogenics Monograph Series book series (ICMS)

Abstract

The loosely packed structure of amorphous polymers makes it possible that, for small segments or side groups, two (or more) neighboring potential minima exist which are separated by a small potential barrier ΔΦ. Place changes between two potential minima take time, the so-called relaxation time τ. It is a function of the potential distribution and the temperature. By external mechanical or dielectric loading the populations of the double well minima are disturbed (see Fig.6.10). The equilibrium is restored by place changes. As the relaxation time of place changes is finite, there is a delay between loading and deformation of a material, which causes dissipation of the loading energy. For cyclic loading a loss-angleδ occurs between stress and strain, which is a function of the temperature and of the load frequency. It determines the damping behavior.

Keywords

Relaxation Time Potential Barrier Side Group Plateau Region Amorphous Polymer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Günther Hartwig
    • 1
    • 2
  1. 1.Kernforschungszentrum KarlsruheKarlsruheGermany
  2. 2.Universität Erlangen-NürnbergErlangenGermany

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