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Water‐soluble polymers. LXXXIII. Correlation of experimentally determined drag reduction efficiency and extensional viscosity of high molecular weight polymers in dilute aqueous solution
Author(s) -
Cowan Martin E.,
Garner Chad,
Hester Roger D.,
McCormick Charles L.
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1956
Subject(s) - drag , extensional viscosity , aqueous solution , polymer , viscosity , rheometer , materials science , polymer chemistry , intrinsic viscosity , viscometer , chemistry , relative viscosity , thermodynamics , composite material , rheology , organic chemistry , physics , shear viscosity
The extensional viscosity for aqueous solutions of high molecular weight poly(acrylamide) copolymers and poly(ethylene oxide) homopolymers was measured using a laboratory‐designed screen extensional rheometer. A Bingham model was developed to estimate the average local polymer coil extensional viscosity (η coil ). A strong correlation was found between the measured η coil values and the polymer extensional viscosity predicted by a bead‐spring model. The dilute aqueous solution drag reduction was measured with a rotating disk instrument under conditions minimizing the effects of shear degradation. Extensional viscosity and drag reduction measurements were performed in deionized water and in 0.514 M sodium chloride. The relative drag reduction efficiency values (Δ) in both solvents were found to strongly correlate with measured η coil values. This is the first report of the accurate prediction of drag reduction behavior for a wide range of polymer types in various solvents from the independently measured molecular parameters η coil and [η] C . The often‐used relative drag reduction efficiency expressed as the product of [η] C and Δ can now be replaced by the absolute drag reduction efficiency [η] C η coil . © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 1222–1231, 2001