NDLI: Shear banding during nonlinear creep with a solution of monodisperse polystyrene

Content Provider	Springer Nature Link
Author	Schweizer, Thomas
Copyright Year	2006
Abstract	Creep experiments with a solution of polystyrene (M w = 2.6 MDa, 16 vol.%, 25 °C) in diethyl phthalate are reported for stresses between 100 and 2,500 Pa (≈ 3G N 0/4). The aim was to look for a flow transition as reported for strongly entangled poly(isobutylene) solutions. The experiments with the polystyrene solution were repeated for cone angles of 2, 4, and 6° (radius 15 mm) and showed no dependence on cone angle. The Cox–Merz rule was not fulfilled for stresses beyond about 800 Pa. The tangential observation with a CCD camera showed that the edge took a concave shape because of the second normal stress difference. Beyond 1,000 Pa, the concave edge develops into a crevice, thus substantially reducing the effective cross-section. This leads to runaway in a constant torque experiment. At p 21 = 800 Pa, head-on particle tracking confirms that the originally linear velocity profile takes a gooseneck shape, thus revealing shear banding. When the creep stress is stepped down to 100 Pa, this velocity profile evolves back to a linear one. The conclusion from this work is that even if nonlinear creep experiments are reproducible and a steady state is reached, this does not mean that the flow field is homogeneous.
Starting Page	629
Ending Page	637
Page Count	9
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	46
Issue Number	5
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-11-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Second normal stress difference Instability Necking Polymer solution Polystyrene Particle tracking Food Science Soft Matter, Complex Fluids Mechanical Engineering Polymer Sciences Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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