The dynamic properties of powder?polymer solution suspensions at large amplitudes were investigated using a coaxial cylinder rheometer. The results are as follows: (1) The time-dependence of stress amplitude σ
0, divided by strain amplitude γ
0 disappears with increasing γ
0, (2) the elastic behavior becomes indistinct, while the plasto-viscous behavior becomes distinct under strain amplitudes larger than 2.0, and (3) the time?temperature superposition principle is applicable to the σ
0/γ
0 vs. ω relation under strain amplitudes larger than 2.0.
The steady flow properties were compared with the results of dynamic measurements. The time?temperature superposition principle is also applicable to η
a vs. γ relations, but η
a does not agree with |η*|. Here η
a is the apparent viscosity, η* is the complex viscosity, and γ is the rate of shear.
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