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Time-dependent polymer rheology under constant stress and under constant shear conditions.A kinetic rate theory previously presented for describing non-Newtonian phenomena has been further modified to predict the flow behavior of viscoelastic materials under constant stress conditions. The thixotropic shear stress or shear rate is predicted by the kinetic theory, and the experimental stress or shear rate is obtained by modifying the thixotropic value by a stress or shear rate retardation term. The retardation term stems from a Maxwellian approach for stress retardation. In order to test the validity of this approach, transient and steady-state data were obtained for two solutions of polymethylmethacrylate in diethylphthalate. Both constant stress measurements and constant shear rate data were taken over a broad range.
Document ID
19720031597
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lee, K. H.
Brodkey, R. S.
(Ohio State University Columbus, Ohio, United States)
Date Acquired
August 6, 2013
Publication Date
January 1, 1971
Publication Information
Publication: Society of Rheology
Subject Category
Fluid Mechanics
Accession Number
72A15263
Funding Number(s)
CONTRACT_GRANT: NSG-591
Distribution Limits
Public
Copyright
Other

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