Nematic effects and strain coupling in entangled polymer melts under strong flow

Jacob Judas Kain Kirkensgaard; Ludovica Hengeller; Andriy Dorokhin; Qian Huang; Christopher J. Garvey; Kristoffer Almdal; Ole Hassager; Kell Mortensen

doi:10.1103/PhysRevE.94.020502

Nematic effects and strain coupling in entangled polymer melts under strong flow

Jacob Judas Kain Kirkensgaard, Ludovica Hengeller, Andriy Dorokhin, Qian Huang, Christopher J. Garvey, Kristoffer Almdal, Ole Hassager, Kell Mortensen

Xray and Neutron Science

9 Citations (Scopus)

Abstract

We use small-angle neutron scattering (SANS) to study labeled short chains with and without the influence of an entangled and highly stretched surrounding environment of longer chains. We find unequivocal evidence of nematic effects as the blend chains in steady state flow are stretched a factor ∼1.5 more from the presence of the long chain nematic field. In the pure melt we confirm that the nonaffine mean-field result ν=0.5 for the strain coupling is still valid for very fast flows, while in the nematic system our analysis predicts an increased coupling constant. We provide a structural explanation for the two first regimes of the nonlinear relaxation, particularly a transition regime where the long chains are relaxing in a sea of reptating short chains.

Original language	English
Article number	020502(R)
Journal	Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)
Volume	94
ISSN	1539-3755
DOIs	https://doi.org/10.1103/PhysRevE.94.020502
Publication status	Published - 24 Aug 2016

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title = "Nematic effects and strain coupling in entangled polymer melts under strong flow",

abstract = "We use small-angle neutron scattering (SANS) to study labeled short chains with and without the influence of an entangled and highly stretched surrounding environment of longer chains. We find unequivocal evidence of nematic effects as the blend chains in steady state flow are stretched a factor ∼1.5 more from the presence of the long chain nematic field. In the pure melt we confirm that the nonaffine mean-field result ν=0.5 for the strain coupling is still valid for very fast flows, while in the nematic system our analysis predicts an increased coupling constant. We provide a structural explanation for the two first regimes of the nonlinear relaxation, particularly a transition regime where the long chains are relaxing in a sea of reptating short chains.",

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T1 - Nematic effects and strain coupling in entangled polymer melts under strong flow

AU - Kirkensgaard, Jacob Judas Kain

AU - Hengeller, Ludovica

AU - Dorokhin, Andriy

AU - Huang, Qian

AU - Garvey, Christopher J.

AU - Almdal, Kristoffer

AU - Hassager, Ole

AU - Mortensen, Kell

PY - 2016/8/24

Y1 - 2016/8/24

N2 - We use small-angle neutron scattering (SANS) to study labeled short chains with and without the influence of an entangled and highly stretched surrounding environment of longer chains. We find unequivocal evidence of nematic effects as the blend chains in steady state flow are stretched a factor ∼1.5 more from the presence of the long chain nematic field. In the pure melt we confirm that the nonaffine mean-field result ν=0.5 for the strain coupling is still valid for very fast flows, while in the nematic system our analysis predicts an increased coupling constant. We provide a structural explanation for the two first regimes of the nonlinear relaxation, particularly a transition regime where the long chains are relaxing in a sea of reptating short chains.

AB - We use small-angle neutron scattering (SANS) to study labeled short chains with and without the influence of an entangled and highly stretched surrounding environment of longer chains. We find unequivocal evidence of nematic effects as the blend chains in steady state flow are stretched a factor ∼1.5 more from the presence of the long chain nematic field. In the pure melt we confirm that the nonaffine mean-field result ν=0.5 for the strain coupling is still valid for very fast flows, while in the nematic system our analysis predicts an increased coupling constant. We provide a structural explanation for the two first regimes of the nonlinear relaxation, particularly a transition regime where the long chains are relaxing in a sea of reptating short chains.

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DO - 10.1103/PhysRevE.94.020502

M3 - Journal article

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SN - 2470-0045

VL - 94

JO - Physical Review E

JF - Physical Review E

M1 - 020502(R)

ER -

Nematic effects and strain coupling in entangled polymer melts under strong flow

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