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The viscosity of concentrated polymer solutions containing low molecular weight solvents
Author(s) -
Richards William D.,
Prud′homme Robert K.
Publication year - 1986
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.1986.070310302
Subject(s) - volume (thermodynamics) , polymer , viscosity , polystyrene , intrinsic viscosity , ethylbenzene , thermodynamics , materials science , relative viscosity , polymer chemistry , shear rate , rheometer , solvent , temperature coefficient , atmospheric temperature range , analytical chemistry (journal) , chemistry , benzene , rheology , chromatography , organic chemistry , composite material , physics
The zero shear rate viscosities of polystyrene/ethylbenzene solutions having polymer weight fractions ranging from 0.5 to 1.0 have been measured using a novel sealed rheometer cell over a temperature range of 50 to 200°C. The concentration and temperature dependence of the solution viscosity has been found to be well described by the relation η 0 = K c a M w 3.4 ζ( c , T ) where the monomeric friction coefficient ζ is determined by the free volume of the solution. Following the procedure of Berry, the free volume parameters, α f ( c )/γ and T ∞ ( c ), and the fractional free volume, f ( c , T )/γ, have been determined. After using these parameters to account for the concentration dependence of the friction coefficient, the concentration exponent a has been evaluated and found to be in reasonable agreement with the value of 3.4 obtained by Berry and Fox for other polymer/solvent systems. A comparison of the relative conributions made by the friction coefficient and the term c 3.4 to the overall concentration dependence of the viscosity of these highly concentrated solutions shows the friction coefficient to be the dominant factor