Nihon Reoroji Gakkaishi
Online ISSN : 2186-4586
Print ISSN : 0387-1533
Original Articles
Primitive Chain Network Simulations on Dielectric Relaxation of Linear Polymers under Shear Flow
Yuichi MasubuchiHiroshi WatanabeGiovanni IannirubertoFrancesco GrecoGiuseppe Marrucci
Author information
JOURNALS FREE ACCESS

Volume 32 (2004) Issue 4 Pages 197-202

Details
Download PDF (366K) Contact us
Abstract

Molecular simulations of entangled linear polymers under fast shear flows, based on the primitive chain network model, are performed to investigate relaxation mechanisms of polymers. It is found that the original primitive chain network model incorporating all known molecular mechanisms (i.e., reptation, tube length fluctuation, thermal and convective constraint release, force balance at each binary entanglement), though in good agreement with typical viscosity curves, shows an excessive acceleration of the end-to-end relaxation in the shear-thinning region, inconsistently with dielectric relaxation experiments. Better agreement with data is achieved if the model is implemented so as to account for hidden entanglement appearance (HEA in the following), a mechanism that modifies constraint renewal in the nonlinear range. HEA partly suppresses the acceleration of the end-to-end relaxation, thus predicting more consistent results with dielectric relaxation experiments, without affecting the shear viscosity curve. A possible interpretation of the effect is offered.

Information related to the author
© 2004 The Society of Rheology, Japan
Previous article Next article

Recently visited articles
feedback
Top