Exploring the mechanism of fracture for entangled polymer liquids in extensional flow

Qian Huang*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

The critical strain and stress at fracture are systematically investigated for two groups of nearly monodisperse linear polystyrene liquids in an extensional flow. The samples in group I have similar number of Kuhn segments per entangled strand (Ne) but different number of entanglements per chain (Z), while the samples in group II have similar Z but different Ne. We found that the critical conditions, especially the critical stress, are independent of Z but influenced by Ne. The observations indicate that the fracture in entangled polystyrene liquids occurs at a length scale smaller than an entangled strand. Therefore, the fracture originates more likely from scission of primary bonds in polymer chains, rather than rapid entanglement slipping. The level of the critical stress also suggests that at fracture, the polymer chains approach their theoretical maximum stretch ratio, which is equal to √Ne
Original languageEnglish
Article number083105
JournalPhysics of Fluids
Volume31
Issue number8
Number of pages8
ISSN1070-6631
DOIs
Publication statusPublished - 2019

Cite this

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title = "Exploring the mechanism of fracture for entangled polymer liquids in extensional flow",
abstract = "The critical strain and stress at fracture are systematically investigated for two groups of nearly monodisperse linear polystyrene liquids in an extensional flow. The samples in group I have similar number of Kuhn segments per entangled strand (Ne) but different number of entanglements per chain (Z), while the samples in group II have similar Z but different Ne. We found that the critical conditions, especially the critical stress, are independent of Z but influenced by Ne. The observations indicate that the fracture in entangled polystyrene liquids occurs at a length scale smaller than an entangled strand. Therefore, the fracture originates more likely from scission of primary bonds in polymer chains, rather than rapid entanglement slipping. The level of the critical stress also suggests that at fracture, the polymer chains approach their theoretical maximum stretch ratio, which is equal to √Ne",
author = "Qian Huang",
year = "2019",
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language = "English",
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Exploring the mechanism of fracture for entangled polymer liquids in extensional flow. / Huang, Qian.

In: Physics of Fluids, Vol. 31, No. 8, 083105, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Exploring the mechanism of fracture for entangled polymer liquids in extensional flow

AU - Huang, Qian

PY - 2019

Y1 - 2019

N2 - The critical strain and stress at fracture are systematically investigated for two groups of nearly monodisperse linear polystyrene liquids in an extensional flow. The samples in group I have similar number of Kuhn segments per entangled strand (Ne) but different number of entanglements per chain (Z), while the samples in group II have similar Z but different Ne. We found that the critical conditions, especially the critical stress, are independent of Z but influenced by Ne. The observations indicate that the fracture in entangled polystyrene liquids occurs at a length scale smaller than an entangled strand. Therefore, the fracture originates more likely from scission of primary bonds in polymer chains, rather than rapid entanglement slipping. The level of the critical stress also suggests that at fracture, the polymer chains approach their theoretical maximum stretch ratio, which is equal to √Ne

AB - The critical strain and stress at fracture are systematically investigated for two groups of nearly monodisperse linear polystyrene liquids in an extensional flow. The samples in group I have similar number of Kuhn segments per entangled strand (Ne) but different number of entanglements per chain (Z), while the samples in group II have similar Z but different Ne. We found that the critical conditions, especially the critical stress, are independent of Z but influenced by Ne. The observations indicate that the fracture in entangled polystyrene liquids occurs at a length scale smaller than an entangled strand. Therefore, the fracture originates more likely from scission of primary bonds in polymer chains, rather than rapid entanglement slipping. The level of the critical stress also suggests that at fracture, the polymer chains approach their theoretical maximum stretch ratio, which is equal to √Ne

U2 - 10.1063/1.5108510

DO - 10.1063/1.5108510

M3 - Journal article

VL - 31

JO - Physics of Fluids

JF - Physics of Fluids

SN - 1070-6631

IS - 8

M1 - 083105

ER -