Abstract
We studied particle size, shape, molecular weight and temperature dependencies of ER effect of poly(ethylene glycol) (PEG) suspensions. The particles were dispersed in low-viscosity silicon oil. We obtained flow curves and dynamic yield stresses by increasing shear rate and compared these with static yield stresses in our previous study (obtained by increasing shear stress). The yield stress under a dc electric field increased by decreasing molecular weight and increasing particle concentration, and did not change with particle size or shape. In addition, significant differences between static and dynamic yield stresses disappeared in absolute value and electric field intensity dependence. And the static yield stress increased with temperature and the dynamic yield stress showed a maximum value at near room temperature. We also measured transient behavior of a PEG suspension at various temperatures and found that it took about 30 seconds to reach the constant viscosity on the application or removal of electric fields. It can be thought that this relatively long response time to create chain structures causes sudden flowing by increasing shear stress gradually and different results between static and dynamic yield stresses.
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