Premium
Viscosity of bead suspensions in polymeric solutions
Author(s) -
Nicodemo L.,
Nicolais L.
Publication year - 1974
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.1974.070180922
Subject(s) - viscometer , shear rate , materials science , viscosity , relative viscosity , rheology , shear thinning , polymer , decalin , composite material , reduced viscosity , newtonian fluid , relaxation (psychology) , polymer chemistry , thermodynamics , chemistry , organic chemistry , psychology , social psychology , physics , catalysis
Viscosity measurements made by a cone‐plate viscometer on polyisobutylene in decalin solutions at different concentrations and their corresponding glass bead suspensions with filler loadings up to 40% by volume are reported. The range of shear rate $ \dot \gamma $ investigated is between 0.1 and 1000 sec −1 . The solutions show shear‐thinning behavior, and the relative viscosity η r of the slurries generally decreases with increasing shear rate. The results indicate two different types of mechanism, respectively at high and low shear rates. At low $ \dot \gamma $ , the relative viscosity can be correlated extending relations already well known for suspensions in Newtonian liquids which are based on the mechanism of aggregate disruption. The behavior at high $ \dot \gamma $ values is believed to be due to the influence of the filler on the flow properties of macromolecules, in particular on relaxation time. Through a shifting procedure, an increase in relaxation time which depends on filler content and not on polymer concentration is shown.