Journal
JOURNAL OF RHEOLOGY
Volume 64, Issue 6, Pages 1373-1378Publisher
SOC RHEOLOGY
DOI: 10.1122/8.0000091
Keywords
local friction; chain alignment; bead-spring simulation
Categories
Funding
- NSF [DMR-1905632]
Ask authors/readers for more resources
The monomer friction coefficient zeta is known to vary with monomer structure, solvent, and concentration; its variation with chain conformation is less well known and appreciated. We explore the decrease of the friction coefficient in the extensional flow of polymer liquids, during which chains become partially stretched and aligned. To induce stretching and alignment similar to the extensional flow without a nonequilibrium flow simulation, we apply equal and opposite forces to the chain ends. We measure the friction coefficient by observing the diffusion of chains along the direction of pull. Our results for friction coefficient versus stretching qualitatively support recent arguments from rheology that friction reduction is necessary to account for smaller than predicted stress overshoots in the startup of the flow. (c) 2020 The Society of Rheology.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available