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Linear Viscoelasticity

The Search for Patterns in the Relaxation of Polymer Melts and Gels
  • Horst Henning Winter
  • Judy Jackson
Chapter
Part of the NATO ASI Series book series (NSSE, volume 302)

Abstract

The linear viscoelasticity of a polymer is uniquely described by the classical theory of linear viscoelasticity. Material properties are contained in the relaxation time spectrum which depends on the molecular details. To address an unsolved problem in rheology, the search for relations between molecular architecture and relaxation, we propose to start out with the most simple molecular architecture and later add molecular details. This proposal bases on the observation that polymers with the mostt simple geometry (long linear flexible chains of uniform length) relax with a universal relaxation time spectrum which is self-similar. Its parameters are a generic expression of chain flexibility, rotational energies of the chemical bonds, atomic masses involved in the molecular motion, molecular interaction forces, etc. of the chemical building blocks. We assume that these generic parameters can be considered fixed for each chemistry and that only few new parameters have to be added when proceeding to architectures which are branched or distributed in size (polydisperse). In a similar fashion one may add specific effects of solvents, molecular interactions, or phase transition (not elaborated here). Generic parameters are given for polystyrene, a polybutadiene, and a polyvinylmethylether.

Keywords

Relaxation Modulus Relaxation Mode Linear Viscoelasticity Longe Relaxation Time Small Amplitude Oscillatory Shear 
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 Dordrecht 1995

Authors and Affiliations

  • Horst Henning Winter
    • 1
  • Judy Jackson
    • 1
  1. 1.Dept. of Chemical Engineering and Dept. of Polymer Science and EngineeringUniversity of MassachusettsAmherstUSA

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