Flow field visualization of entangled polybutadiene solutions undernonlinear viscoelastic flow conditions

Yanfei Li, Miao Hu, Gregory McKenna, Christopher J. Dimitriou, Gareth H. McKinley, Rebecca M. Mick, David C. Venerus, Lynden A. Archer

Research output: Contribution to journalArticlepeer-review

Abstract

Using self-designed particle visualization instrumentation, startup shear and step-strain tests were conducted under a series of systematically varied rheological and geometrical conditions, and the velocity profiles in three different well-entangled polybutadiene/oligomer solutions were obtained. For startup shear tests, in the regime of entanglement densities up to 89 and nominal reptation Weissenberg numbers up to 18.6, we generally observe either wall slip and a linear velocity/strain profile or simply the linear profile with no wall slip unless a massive edge fracture or instability has occurred in the sample. Meanwhile, step-strain tests conducted at similar and higher step Weissenberg numbers revealed little particle motion upon cessation. These results lead us to a conclusion that there is no compelling evidence of shear banding or nonquiescent relaxation in the range of entanglement density and Wi investigated; we interpret the results to imply that any observed banding proba
Original languageEnglish
Pages (from-to)1411-1428
JournalJournal of Rheology
StatePublished - Sep 2013

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