Polyaniline composite electrorheological fluid

Abstract

The invention discloses a polyaniline composite electrorheological fluid. A dispersed phase of the electrorheological fluid is a polyaniline / Fe2O3 composite particle, a dispersed medium is simethicone, and the polyaniline / Fe2O3 composite particle is prepared from iron powder and aniline monomers by taking a camphorsulfonic acid as a doping acid and taking ammonium persulfate as an oxidant at room temperature, therefore, the preparation process is simple, raw materials are easily available, and no reactant is required to be added; and after polyaniline is combined with Fe2O3, the performance of the material is improved, wherein when the ratio of the mass of the polyaniline / Fe2O3 composite particle to the volume of the simethicone is 0.30g:1ml, the yield stress of the obtained electrorheological fluid can reach 10 kPa under the condition of 4.3 kV / mm, which is 3.7 times as large as that of an electrorheological fluid taking pure polyaniline as the dispersed phase, and 13.0 times as large as that of an electrorheological fluid taking pure Fe2O3 as the dispersed phase, and the performance of the polyaniline composite electrorheological fluid is obviously superior to those of polyaniline and Fe2O3 composited electrorheological materials prepared by using the other methods.

Description

technical field [0001] The invention relates to an electrorheological material and a preparation method thereof, in particular to a polyaniline / Fe 2 o 3 The composite particle is the electrorheological fluid of the dispersed phase. Background technique [0002] Electrorheological fluid is an important smart material, which is usually a suspension system formed by dispersing solid particles with high dielectric constant and low conductivity in insulating oil with low dielectric constant. Under an applied electric field condition, they can rapidly and reversibly change from a fluid-like state to a solid-like state, thereby displaying tunable rheological properties. The characteristics of electrorheological fluids make it a potential advantage in enhancing the electromechanical conversion efficiency of various devices, such as clutches, valves, damping devices, human muscle stimulators, mechanical sensors, and so on. In order to meet the needs of these applications, electror...

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Problems solved by technology

CN 103224831A discloses an electrorheological fluid and its preparation method. The dispersed phase of the electrorheological fluid is a coated magnetic nanocomposite particle composed of flower-shaped iron oxide nanoparticles and polyaniline. The preparation process is first The flower-like ethylene glycol-based iron precursor was prepared by high-temperature reflux method. The ethylene glycol-based iron was converted into iron oxide after calcination, and then polyaniline nanoparticles were grown in situ on this basis to prepare rose flower-like iron oxide. / Polyaniline nanocomposite material, the preparation process is complex, requires high temperature reflow and calcination, and its electrorheological properties only show the performance of shear stress lower than 200Pa under the condition of 2.5kV / mm

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