Premium
Estimation of viscosities of mixed polymer solutions
Author(s) -
Rudin Alfred,
Hoegy Howard L. W.,
Johnston H. Kirk
Publication year - 1972
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.1972.070160518
Subject(s) - viscosity , thermodynamics , polymer , solvent , binary number , relative viscosity , reduced viscosity , intrinsic viscosity , materials science , flory–huggins solution theory , chemistry , organic chemistry , mathematics , physics , arithmetic
A semiempirical model for estimation of viscosities of concentrated polymer solutions 1 can be applied to mixtures of polymers in a common solvent. The data required for estimation of mixture viscosity are: solvent viscosity, polymer molecular weight, density, concentration, and intrinsic viscosity in the particular solvent. Calculated and experimental viscosities agree to within a few per cent for the relatively nonpolar systems for which comparative data are available. The model does not appear to be adequate for mixtures in which there are extensive hydrogen‐bonding interactions. Results of the new model are equivalent to those of an empirical equation 2 reported to be effective for fairly concentrated binary polymer mixtures. Specific interactions between polymeric solutes can be conveniently assessed by comparing measured mixture viscosity to that calculated from the model presented. It is not clear, however, that such assessments have any fundamental significance, since the interactions which are calculated depend on the assumptions inherent in the estimation of the “ideal” mixture viscosity. The same reservations apply to other models which have been proposed for this purpose.