Rheologica Acta

, Volume 40, Issue 5, pp 403–415 | Cite as

Linear rheology of diluted linear, star and model long chain branched polymer melts

  • D. Robert Daniels
  • Thomas C. B. McLeish
  • Rama Kant
  • Bryan J. Crosby
  • Ronald N. Young
  • Andrew Pryke
  • Jürgen Allgaier
  • D. J. Groves
  • R. J. Hawkins
ORIGINAL CONTRIBUTION

Abstract

We present experiments and theory on the diluted melt dynamics of monodisperse entangled polymers of linear, star and H-shaped architecture. Frequency-dependent rheological data on a series of progressively diluted linear, star and H-polymers are in good agreement with a refined tube-model theory that, for H-polymers, combines star polymer melt behaviour at high frequency, with linear polymer reptation behaviour at low frequencies. Taking into account the effect of dilution via some simple scaling relations, mild polydispersity and by incorporating the high frequency Rouse modes, we are able to model quantitatively the entire frequency range. This work suggests a novel rheological route to analysing long chain branching in polymer melts.

Key words Melt rheology Branched polymers Dilution 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • D. Robert Daniels
    • 1
  • Thomas C. B. McLeish
    • 1
  • Rama Kant
    • 1
  • Bryan J. Crosby
    • 1
  • Ronald N. Young
    • 2
  • Andrew Pryke
    • 2
  • Jürgen Allgaier
    • 3
  • D. J. Groves
    • 1
  • R. J. Hawkins
    • 1
  1. 1.IRC in Polymer Science and Technology, Department of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK e-mail: phyrd@phys-irc.leeds.ac.ukGB
  2. 2.Department of Chemistry, University of Sheffield, Sheffield, S2 2UN, UKGB
  3. 3.Institut für Festkörperforschung, FZ Jülich GmbH, 52425, Jülich, GermanyDE

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