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Viscoelastic properties of dilute aqueous solution of methylcellulose at ultrasonic frequencies
Author(s) -
Amari Takeshi,
Nakamura Matao
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.1974.070181113
Subject(s) - viscoelasticity , aqueous solution , viscosity , materials science , extrapolation , intrinsic viscosity , ultrasonic sensor , thermodynamics , chemistry , polymer , analytical chemistry (journal) , composite material , chromatography , physics , mathematical analysis , mathematics , acoustics
The viscoelastic properties of dilute aqueous solutions of methylcellulose at ultrasonic frequencies were investigated by a torsional method using quartz crystal resonators. The concentration dependences of G′ and G″ – ωη s increased with increasing temperature at 13 kHz, but at higher frequencies G′ and G″ – ωη s were simply proportional to the concentration irrespective of temperature. These results may be explained by the difference of corresponding viscoelastic mechanism at measuring frequencies. In order to examine the configuration of methylcellulose in water, which changes remarkably with temperature, the intrinsic values at various temperatures were experimentally obtained by extrapolation to zero concentration, and the frequency dependence of intrinsic dynamic viscosity was examined. The values of components of the complex intrinsic viscosity at various temperatures and their frequency dependences were quantitatively compared with those calculated from the Tschoegl theory. The values of hydrodynamic strength parameter in the Tschoegl theory for an aqueous solution of methylcellulose increased with increasing temperature, and an effect of the internal viscosity due to the aggregation of methylcellulose was observed at higher temperatures. However, on the whole, the viscoelastic behavior was relatively close to Rouse‐like behavior.