Abstract

Stress response of an ionic exchange resin suspension was measured by two types of stimulus; a step electric field in a steady shear flow and sinusoidal strain with various amplitudes under dc electric fields. It was found that the stress response to a step electric field of 1.38 kV/mm in a steady shear flow of 2.3 s−1 was composed of plural modes that took place in succession. These modes were assigned to fast and slow modes with response time of 7 and 100 ms, respectively. Also, it was found that sinusoidal wave forms of the stress response to the sinusoidal strain of 0.5 Hz in the dc electric fields up to 2 kV/mm changed to nonsinusoidal ones with yield stress above critical amplitudes of strain.

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