High Resolution Shear Profile Measurements in Entangled Polymers
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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.
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This study was supported by the National Science Foundation (DMR0551185 and DMR0606040) and by KAUST-CU Center for Energy and Sustainability. We are grateful to Erik Herz and Ulrich Wiesner for providing fluorescent nanoparticle tracers used in the study.
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2008-11-17
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Physical Review Letters
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entangled polymers; interfacial slip
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Phys Rev Lett. 2008 Nov 21;101(21):218301. Epub 2008 Nov 17.
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