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On the dynamics of dense polymer systems

  • D. Richter
  • B. Ewen
  • L. J. Fetters
  • J. S. Huang
  • B. Farago
Chapter
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 91)

Abstract

We discuss experimental results on molecular motion in polymer melts, obtained by neutron spin-echo spectroscopy (NSE). For longer times we observe systematic deviations from the Rouse model, revealing the presence of a well-defined intermediate dynamical length scale beyond which density fluctuations within a given chain are strongly reduced. Its value is found to be in excellent agreement with the entanglement distance obtained from rheological measurements. Measurements of the temperature dependence and polymer volume fraction dependence of the entanglement distance give an insight into the molecular origin of entanglement constraints.

Key words

Reptation entanglements neutron spin-echo polymer melts microscopic dynamics 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1993

Authors and Affiliations

  • D. Richter
    • 1
    • 5
  • B. Ewen
    • 2
  • L. J. Fetters
    • 3
  • J. S. Huang
    • 3
  • B. Farago
    • 4
  1. 1.IFF des Forschungszentrums JülichFRG
  2. 2.MPI für Polymerforschung MainzFRG
  3. 3.Exxon Research and Engineering Co.AnnandaleUSA
  4. 4.Institut Laue Langevin GrenobleFrance
  5. 5.KFA JülichJülichFRG

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