Theoretical Linear and Nonlinear Rheology of Symmetric Treelike Polymer Melts

2001 ◽  
Vol 34 (8) ◽  
pp. 2579-2596 ◽  
Author(s):  
Richard J. Blackwell ◽  
Oliver G. Harlen ◽  
Tom C. B. McLeish
Keyword(s):  
Polymer Melts ◽  
Nonlinear Rheology ◽  
Linear And Nonlinear

scholarly journals Effect of Hydrogen Bonding on Linear and Nonlinear Rheology of Entangled Polymer Melts

2015 ◽  
Vol 48 (16) ◽  
pp. 5988-5996 ◽  
Author(s):  
Aamir Shabbir ◽  
Hadi Goldansaz ◽  
Ole Hassager ◽  
Evelyne van Ruymbeke ◽  
Nicolas J. Alvarez
Keyword(s):  
Hydrogen Bonding ◽  
Polymer Melts ◽  
Nonlinear Rheology ◽  
Entangled Polymer ◽  
Linear And Nonlinear ◽  
Entangled Polymer Melts

scholarly journals Linear and nonlinear rheology of wormlike micelles

Pramana ◽  
1999 ◽  
Vol 53 (1) ◽  
pp. 223-235 ◽  
Author(s):  
A K Sood ◽  
Ranjini Bandyopadhyay ◽  
Geetha Basappa
Keyword(s):  
Wormlike Micelles ◽  
Nonlinear Rheology ◽  
Linear And Nonlinear

scholarly journals A slip-spring simulation model for predicting linear and nonlinear rheology of entangled wormlike micellar solutions

2020 ◽  
Vol 64 (5) ◽  
pp. 1045-1061 ◽  
Author(s):  
Takeshi Sato ◽  
Soroush Moghadam ◽  
Grace Tan ◽  
Ronald G. Larson
Keyword(s):  
Simulation Model ◽  
Micellar Solutions ◽  
Nonlinear Rheology ◽  
Linear And Nonlinear

Some aspects of linear and nonlinear viscoelastic behaviour of polymer melts in shear

1982 ◽  
Vol 21 (4-5) ◽  
pp. 376-387 ◽  
Author(s):  
H. C. Booij ◽  
J. H. M. Palmen
Keyword(s):  
Polymer Melts ◽  
Viscoelastic Behaviour ◽  
Nonlinear Viscoelastic ◽  
Linear And Nonlinear

scholarly journals Nonlinear Rheology of Unentangled Polymer Melts Reinforced with High Concentration of Rigid Nanoparticles

2010 ◽  
Vol 5 (4) ◽  
pp. 791-794 ◽  
Author(s):  
Alireza S. Sarvestani
Keyword(s):  
Polymer Melts ◽  
High Concentration ◽  
Nonlinear Rheology

Linear and nonlinear rheology of polymer/layered silicate nanocomposites

2010 ◽  
Vol 54 (3) ◽  
pp. 539-562 ◽  
Author(s):  
Hassan Eslami ◽  
Miroslav Grmela ◽  
Mosto Bousmina
Keyword(s):  
Layered Silicate ◽  
Nonlinear Rheology ◽  
Silicate Nanocomposites ◽  
Linear And Nonlinear

Molecular Drag-Strain Coupling in Branched Polymer Melts

2000 ◽  
Vol 629 ◽  
Author(s):  
Richard J. Blackwell ◽  
Tom C. B. McLeish ◽  
Oliver G. Harlen
Keyword(s):  
Branch Point ◽  
Polymer Melts ◽  
Uniaxial Extension ◽  
Extensional Viscosity ◽  
Low Density Polyethylene ◽  
Model Parameters ◽  
Low Density ◽  
Branch Points ◽  
Nonlinear Rheology ◽  
Branched Polymer

ABSTRACTThe “pom-pom” model of McLeish and Larson (J. Rheol. 42, 81, 1998) provides a simple molecular theory for the nonlinear rheology of long chain branched polymer melts. The Edwards-de Gennes tube concept is used to derive a constitutive equation for a simple branched molecule composed of two star polymers linked by a single backbone chain. A feature of this model is that the backbone section of tube can stretch up to maximum length given by the maximum entropic drag-force from the arms, after which the star arms are withdrawn into the backbone tube. This produces a sharp transition in the extensional viscosity at this maximum stretch. This unphysical feature results from an over-simplification of the behaviour near the branch points.In this paper we introduce a simple treatment of the coupling between relaxed and unrelaxed polymer segments at branch-points. This allows for localised displacements of branch-point within a quadratic potential before maximum extension is reached. Displacing the branch-point reduces the length of arm outside the tube and so reduces in the drag on the star arms. This smoothes out the sharp transitions in extensional viscosity in the original “pom-pom” model at the cost of introducing an extra unknown parameter.This modification improves the prediction of the nonlinear rheology of H-polymers whose molecular structure is known. Alternatively, for polymers of unknown structure such as commercial Low Density Polyethylene, the model parameters may be fitted from linear viscoelastic and uniaxial extension data, to provide predictions for the behaviour in transient nonlinear shear and planar extension. By including local branch-point displacement we find improved agreement with the data for Low-Density Polyethylene.

scholarly journals Effect of Screening of Intermicellar Interactions on the Linear and Nonlinear Rheology of a Viscoelastic Gel

Langmuir ◽  
2003 ◽  
Vol 19 (8) ◽  
pp. 3121-3127 ◽  
Author(s):  
Ranjini Bandyopadhyay ◽  
A. K. Sood
Keyword(s):  
Nonlinear Rheology ◽  
Linear And Nonlinear

Linear and Nonlinear Rheology of Two Dimensional Polymers—a Brownian Dynamics Study

2008 ◽  
Author(s):  
Jun-ichi Takimoto ◽  
Yuko Ogawa ◽  
Albert Co ◽  
Gary L. Leal ◽  
Ralph H. Colby ◽  
...  
Keyword(s):  
Brownian Dynamics ◽  
Two Dimensional ◽  
Nonlinear Rheology ◽  
Linear And Nonlinear
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