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Correlations for zero‐shear and shear‐rate dependent viscosity of polymeric solutions
Author(s) -
Chitrangad B.,
Osmers H. R.,
Middleman S.
Publication year - 1977
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760171109
Subject(s) - polymer , thermodynamics , solvent , viscosity , materials science , shear rate , relative viscosity , shear (geology) , reduced viscosity , newtonian fluid , rheology , apparent viscosity , theta solvent , intrinsic viscosity , inherent viscosity , polymer chemistry , composite material , chemistry , solvent effects , organic chemistry , physics
Solution viscosity is known to be sensitive to the nature of solvent and the polymer concentration. The magnitude of such effects, however, is not quantitatively understood. Correlations to predict zero‐shear and shear‐rate dependent viscosity of polymer solutions from polymer solution parameters are presented. Polymer domain volume is found to be the controlling parameter for the zero‐shear viscosity of dilute polymer solutions, that is solutions with insignificant entanglements. At higher concentrations, where polymer‐polymer interactions become significant, it is found that, except for the magnitude of the solvent viscosity, the nature of the solvent is of no consequence. In this region zero‐shear viscosity is correlated as a function of the parameter cM 5/8 , where C and M represent concentration and molecular weight, respectively. A relaxation time such as Bueche's time constant satisfactorily represents the solvent effects on the non‐Newtonian behavior of polymer solutions by incorporating the measured zero‐shear and solvent viscosities.