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Measurement of shear‐dependent intrinsic viscosities of carboxymethyl cellulose and xanthan gum suspensions
Author(s) -
Young San Land,
Shoemaker Charles F.
Publication year - 1991
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.1991.070420905
Subject(s) - carboxymethyl cellulose , xanthan gum , dilution , rheometer , aqueous solution , rheology , shear rate , chemistry , materials science , suspension (topology) , cellulose , chromatography , sodium , composite material , thermodynamics , organic chemistry , physics , mathematics , homotopy , pure mathematics
Abstract A rotational rheometer with cone and plate fixtures was used to measure the intrinsic viscosities of aqueous suspensions of xanthan gum and carboxymethyl cellulose (CMC). The reduced viscosities or hydrodynamic volumes of CMC suspensions increased with dilution. However, the reduced viscosities of xanthan gum suspensions decreased with dilution within the concentration range of 0.1–0.06% and increased with dilution within the concentration range of 0.04–0.01%. When the gums were suspended and diluted with 0.06 M sodium acetate, the reduced viscosities of all the xanthan gum and CMC suspensions decreased upon dilution. The intrinsic viscosities of xanthan gum and CMC suspensions decreased with increasing the shear rate, showing a dependence of hydrodynamic volume on shear rate.