The mechanical properties of polyaniline Electrorheological fluid

The better mechanical properties of Electrorheological fluid (ERF) are the key for its successful engineering application. The mechanical characteristics of the polyaniline (PAn) ERF were tested on modified TA Instrument AR500 Rheometer in this paper. The experimental results of the steady flow show that the shear stress produced by ERF increased with the rise in electric field strength and concentration of volume ratio. The curves of dynamic yield stress vs. electric field strength shows that the relationship between them approximately takes on exponential rule, and the dynamic yield stress increased with the rise in concentration of volume ratio. Dynamic oscillatory test results show that the ER effect will be significantly enhanced with the rise in electric field strength and will be apparently inhibited with the rise in vibration amplitude; while the effect of vibration frequency on dynamic properties of ERF is almost neglected.