Coarse-grained model of entangled polymer melts in non-equilibrium

2008 ◽  
Vol 47 (9) ◽  
pp. 1039-1048 ◽  
Author(s):  
A. Rakshit ◽  
R. C. Picu
Keyword(s):  
Polymer Melts ◽  
Coarse Grained ◽  
Coarse Grained Model ◽  
Entangled Polymer ◽  
Entangled Polymer Melts ◽  
Non Equilibrium

A highly coarse-grained model to simulate entangled polymer melts

2012 ◽  
Vol 136 (14) ◽  
pp. 144903 ◽  
Author(s):  
You-Liang Zhu ◽  
Hong Liu ◽  
Zhong-Yuan Lu
Keyword(s):  
Polymer Melts ◽  
Coarse Grained ◽  
Coarse Grained Model ◽  
Entangled Polymer ◽  
Entangled Polymer Melts

Coarse grained model of entangled polymer melts

2006 ◽  
Vol 125 (16) ◽  
pp. 164907 ◽  
Author(s):  
A. Rakshit ◽  
R. C. Picu
Keyword(s):  
Polymer Melts ◽  
Coarse Grained ◽  
Coarse Grained Model ◽  
Entangled Polymer ◽  
Entangled Polymer Melts

scholarly journals Simple, Accurate and User-Friendly Differential Constitutive Model for the Rheology of Entangled Polymer Melts and Solutions from Non-Equilibrium Thermodynamics

2020 ◽  
Author(s):  
Pavlos Stephanou ◽  
Ioanna Tsimouri ◽  
Vlasis Mavrantzas
Keyword(s):  
Large Scale ◽  
Polymer Melts ◽  
Second Law Of Thermodynamics ◽  
Equilibrium Thermodynamics ◽  
High Shear Rates ◽  
Entangled Polymer ◽  
Conformation Tensor ◽  
Entangled Polymer Melts ◽  
User Friendly ◽  
Non Equilibrium

In a recent reformulation of the Marrucci-Ianniruberto constitutive equation for the rheology of entangled polymer melts in the context of non-equilibrium thermodynamics, rather large values of the convective constraint release parameter \beta_{ccr} had to be used in order not to violate the second law of thermodynamics. In this work, we present an appropriate modification of the model which avoids the splitting of the evolution equation for the conformation tensor into an orientation and a stretching part. Then, thermodynamic admissibility dictates simply that \beta_{ccr}≥ 0, thus allowing for more realistic values of \beta_{ccr} to be chosen. Moreover, and in view of recent experimental evidence for a transient stress undershoot (following the overshoot) at high shear rates whose origin may be traced back to molecular tumbling, we have incorporated in the model additional terms accounting, at least in an approximate way, for non-affine deformation through a slip parameter \xi. Use of the new model to describe available experimental data for the transient and steady-state shear and elongational rheology of entangled polystyrene melts and solutions shows close agreement. Overall, the modified model proposed here combines simplicity with accuracy, which renders it an excellent choice for managing complex viscoelastic fluid flows in large-scale numerical calculations.

Direct Rheological Evidence of Monomer Density Reequilibration for Entangled Polymer Melts

2007 ◽  
Vol 40 (8) ◽  
pp. 2946-2954 ◽  
Author(s):  
Chen-Yang Liu ◽  
Roland Keunings ◽  
Christian Bailly
Keyword(s):  
Polymer Melts ◽  
Entangled Polymer ◽  
Entangled Polymer Melts ◽  
Monomer Density

Stochastic chain simulation of wall slip in entangled polymer melts

2007 ◽  
Vol 51 (3) ◽  
pp. 451-464 ◽  
Author(s):  
Fang Xu ◽  
Morton M. Denn ◽  
Jay D. Schieber
Keyword(s):  
Polymer Melts ◽  
Wall Slip ◽  
Entangled Polymer ◽  
Entangled Polymer Melts

scholarly journals Viscoelastic Response of Dispersed Entangled Polymer Melts

2020 ◽  
Vol 53 (19) ◽  
pp. 8400-8405
Author(s):  
Brandon L. Peters ◽  
K. Michael Salerno ◽  
Ting Ge ◽  
Dvora Perahia ◽  
Gary S. Grest
Keyword(s):  
Polymer Melts ◽  
Viscoelastic Response ◽  
Entangled Polymer ◽  
Entangled Polymer Melts
Sign in / Sign up

Export Citation Format

Share Document