Journal article
Relating Chain Conformations to Extensional Stress in Entangled Polymer Melts
Physical review letters, v 121(4), pp 047801-047801
26 Jul 2018
PMID: 30095953
Abstract
Nonlinear extensional flows are common in polymer processing, but they remain challenging theoretically because dramatic stretching of chains deforms the entanglement network far from equilibrium. Here, we present coarse-grained simulations of extensional flows in entangled polymer melts for Rouse-Weissenberg numbers Wi(R) = 0.06-52 and Hencky strains epsilon >= 6. Simulations reproduce experimental trends in extensional viscosity with time, rate, and molecular weight. Studies of molecular structure reveal an elongation and thinning of the confining tube with increasing WiR. The rising stress is quantitatively consistent with the decreasing entropy of chains at the equilibrium entanglement length. Molecular weight dependent trends in viscosity are related to a crossover from the Newtonian limit to a high rate limit that scales differently with chain length.
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Details
- Title
- Relating Chain Conformations to Extensional Stress in Entangled Polymer Melts
- Creators
- Thomas C. O'Connor - Johns Hopkins UniversityNicolas J. Alvarez - Drexel UniversityMark O. Robbins - Johns Hopkins University
- Publication Details
- Physical review letters, v 121(4), pp 047801-047801
- Publisher
- Amer Physical Soc
- Number of pages
- 6
- Grant note
- W911NF-12-2-0022 / US Army Research Laboratory; United States Department of Defense; US Army Research Laboratory (ARL)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000439795800007
- Scopus ID
- 2-s2.0-85050666731
- Other Identifier
- 991019167740304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Physics, Multidisciplinary