Linear rheology of diluted linear, star and model long chain branched polymer melts |
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Authors: | 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 |
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Institution: | 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.uk, GB Department of Chemistry, University of Sheffield, Sheffield, S2 2UN, UK, GB Institut für Festk?rperforschung, FZ Jülich GmbH, 52425, Jülich, Germany, DE
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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.
Received: 6 April 2000/Accepted: 21 December 2000 |
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Keywords: | Melt rheology Branched polymers Dilution |
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