Temperature dependent rheology of surfactant-hydroxypropyl cellulose solutions. Page: 8
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Shear stress/shear rate curves of QASM at varying concentrations were examined.
For concentrations under 19% w/w the shear stress varied smoothly with increasing shear
rate, which is a characteristic of liquid-like systems. At concentrations of 19% w/w and
above, a yield stress was observed, which was shown by a sharp increase in the rate of
deformation above a certain value. This indicates that above 19% w/w the system
becomes gel-like and does not flow under small stresses. The system will begin to flow
more easily above the yield stress. There also was a nonmonotonic change in the slope
resulting in a shoulder in the stress/rate curve. The shoulder indicates a discontinuous
flow-induced increase in the apparent viscosity. For ramp times from 5 to 45 min., the
same behavior was observed, therefore an assumption was made that the shoulder was
not caused by nonequilibrium measurements.
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Snively, C. Todd. Temperature dependent rheology of surfactant-hydroxypropyl cellulose solutions., thesis, December 2002; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc3312/m1/12/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .