High resolution shear profile measurements in entangled polymers
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.
Date Published
Journal
Physical Review Letters
Volume
101
Issue
21
URL
https://www.scopus.com/inward/record.uri?eid=2-s2.0-56849092586&doi=10.1103%2fPhysRevLett.101.218301&partnerID=40&md5=17725f164f1d37d80543c0bbd4e92bfb
DOI
10.1103/PhysRevLett.101.218301
Research Area
Group (Lab)
Itai Cohen Group