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Mechanical relaxation in solid polymers: Proposal for a new approach and a solution of Heijboer's problem

  • L. C. E. Struik
Conference paper
Part of the Lecture Notes in Physics book series (LNP, volume 277)

Abstract

This paper deals with the application of the two-potential-well model for the description of secondary relaxation in glassy polymers. The model is outlined and it is shown that the theoretical predictions do not, or only partially, agree with experiment. It is also shown that the model contains some serious inconsistencies, the most important one being the fact that the coupling of the molecule responsible for relaxation and its immediate environment is neglected. A new model is proposed in which this coupling is taken into consideration. The exact way of coupling is found by considering the fact that the glassy environment has once been prepared by cooling the polymer from the molten state above Tg to the glassy state below Tg . The new model works satisfactorily and can explain the paradoxical situation that strong coupling with the environment is not in contradiction with the experimental finding that, at least for the chair-chair relaxation of cyclohexyl rings, the activation parameters are almost independent of the environment of the ring.

Keywords

Stress Field Activation Parameter Glassy State Mechanical Coupling Potential Energy Curve 
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Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • L. C. E. Struik
    • 1
  1. 1.Plastics and Rubber Research Institute TNOAB DelftThe Netherlands

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