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Comparing tube models for predicting the linear rheology of branched polymer melts.
- Source :
- Journal of Rheology; Mar2010, Vol. 54 Issue 2, p223-260, 38p, 2 Diagrams, 4 Charts, 11 Graphs
- Publication Year :
- 2010
-
Abstract
- The hierarchical and “bob” (or branch-on-branch) models are tube-based computational models recently developed for predicting the linear rheology of general mixtures of polydisperse branched polymers. These two models are based on a similar tube-theory framework but differ in their numerical implementation and details of relaxation mechanisms. We present a detailed overview of the similarities and differences of these models and examine the effects of these differences on the predictions of the linear viscoelastic properties of a set of representative branched polymer samples in order to give a general picture of the performance of these models. Our analysis confirms that the hierarchical and bob models quantitatively predict the linear rheology of a wide range of branched polymer melts but also indicate that there is still no unique solution to cover all types of branched polymers without case-by-case adjustment of parameters such as the dilution exponent α and the factor p<superscript>2</superscript> which defines the hopping distance of a branch point relative to the tube diameter. An updated version of the hierarchical model, which shows improved computational efficiency and refined relaxation mechanisms, is introduced and used in these analyses. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01486055
- Volume :
- 54
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Journal of Rheology
- Publication Type :
- Academic Journal
- Accession number :
- 48591248
- Full Text :
- https://doi.org/10.1122/1.3301246