High Resolution Shear Profile Measurements in Entangled Polymers
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Hayes, K.A.; Buckley, M.R.; Cohen, I.; Archer, L.A.
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< or =Z< or =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.
Physical Review Letters
entangled polymers; interfacial slip
Previously Published As
Phys Rev Lett. 2008 Nov 21;101(21):218301. Epub 2008 Nov 17.