NDLI: Transient behavior of Boger fluids under extended shear flow in a cone-and-plate rheometer

Content Provider	Springer Nature Link
Author	Calado, Verônica M. A. White, James M. Muller, Susan J.
Copyright Year	2004
Abstract	Three different dilute solutions of high molecular weight polymers in viscous, binary solvents were used in experiments performed in a cone-and-plate rheometer. The solutions all fall into the class of fluids referred to as “Boger fluids” and were previously used in studies of viscoelastic Taylor-Couette instabilities. Under prolonged shearing in the cone-and-plate geometry, these fluids all exhibited a decrease of the first normal stress growth function N1+(t) from an initial plateau value to a second, lower plateau value. This behavior has been previously observed, but is here reported for widely used polyisobutylene-based Boger fluids for the first time. As in earlier studies (Magda JJ, Lee C-S, Muller SJ, Larson RG (1993) Macromolecules 26:1696–1706; MacDonald M, Muller SJ (1997) J Rheol Acta 36:97–109), the time at which this decrease occurs (the decay time) is much longer than the polymer molecule’s relaxation time. Here, we focus on three issues: 1) the time-temperature superposition of the first normal stress growth function N1+(t), including the decay time and the value of the second plateau, 2) the sample recovery time required to reproduce the initial plateau value of N1+ and the decay time, and 3) the relationship between the time scales for this decay of normal stresses and the onset of viscous heating induced instabilities in the Taylor-Couette geometry. Our results suggest that shear-induced conformational changes, possibly coupled to viscous heating of the sample, may be responsible for the decrease in the first normal stress growth function during prolonged shearing.
Starting Page	250
Ending Page	261
Page Count	12
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	44
Issue Number	3
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-08-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Transient behavior Boger fluids Extended shear flow Cone-and-plate rheometer High molecular weight polymers Viscous solvents Binary solvents
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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