Accessibility navigation


Time-dependent orientation coupling in equilibrium polymer melts

Downloads

Downloads per month over past year

Cao, J. and Likhtman, A. E. (2010) Time-dependent orientation coupling in equilibrium polymer melts. Physical Review Letters, 104 (20). 207801. ISSN 0031-9007

[img] Text - Published Version
· Please see our End User Agreement before downloading.

268Kb

To link to this article DOI: 10.1103/PhysRevLett.104.207801

Abstract/Summary

The motion in concentrated polymer systems is described by either the Rouse or the reptation model, which both assume that the relaxation of each polymer chain is independent of the surrounding chains. This, however, is in contradiction with several experiments. In this Letter, we propose a universal description of orientation coupling in polymer melts in terms of the time-dependent coupling parameter κ(t). We use molecular dynamics simulations to show that the coupling parameter increases with time, reaching about 50% at long times, independently of the chain length or blend composition. This leads to predictions of component dynamics in mixtures of different molecular weights from the knowledge of monodisperse dynamics for unentangled melts. Finally, we demonstrate that entanglements do not play a significant role in the observed coupling. © 2010 The American Physical Society

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Mathematics and Statistics
ID Code:17181
Publisher:American Physical Society

Download Statistics for this item.

University Staff: Request a correction | Centaur Editors: Update this record

Page navigation