High Resolution Shear Profile Measurements in Entangled Polymers

Keesha A. Hayes, Mark R. Buckley, Itai Cohen, Lynden A. Archer

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We use confocal microscopy and particle image velocimetry to visualize motion of 250-300 nm. fluorescent tracer particles in entangled polymers subject to a rectilinear shear flow. Our results show linear velocity profiles in polymer solutions spanning a wide range of molecular weights and number of entanglements (8≤Z≤56), but reveal large differences between the imposed and measured shear rates. These findings disagree with recent reports that shear banding is a characteristic flow response of entangled polymers, and instead point to interfacial slip as an important source of strain loss. © 2008 The American Physical Society.
Original languageEnglish (US)
JournalPhysical Review Letters
Volume101
Issue number21
DOIs
StatePublished - Nov 17 2008
Externally publishedYes

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