Quantitative predictions of linear viscoelastic rheological properties of entangled polymers |
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| Authors: | Cattaleeya Pattamaprom Ronald G Larson Timothy J Van Dyke |
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| Institution: | (1) Department of Chemical Engineering University of Michigan Ann Arbor, MI 48109, USA e-mail: rlarson@engin.umich.edu, US;(2) Department of Mechanical and Aerospace Engineering University of California at San Diego, |
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| Abstract: | The “dual constraint” model developed by Mead, Van Dyke et al. is here extended by inclusion of “early-time” contour-length
fluctuations and constraint-release Rouse relaxation, and then evaluated by comparing its predictions with literature data
for over 50 different linear and star polymers. By combining the reptation model of Doi and Edwards with contour-length fluctuations
and constraint release, the model provides a systematic approach to prediction of the rheological properties of polymers.
The parameters are taken from the literature and used consistently for linear polymers, star polymers, and their mixtures
having the same chemical compositions. In most cases, the predictions of the model appears to agree well with data for monodisperse,
bidisperse, and polydisperse linear and star polymers, except at low molecular weights.
Received: 23 December 1999 Accepted: 28 March 2000 |
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| Keywords: | Linear viscoelastic Double reptation Constraint release Linear polymers Star polymers |
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