Abstract
γ-Fe2O3/polyacrylate composite particles were synthesized through inversed emulsion polymerization. The particles were then dispersed in silicone oil, forming the electrorheological fluid. The effects of the chemical constitution of the particles, including the content of γ-Fe2O3, the crosslinking agent N,N′-methylene-bis acryl-amide (MBAM) and the comomoner maleic anhydride (MA) on the shear stress of the fluid were investigated under direct and alternating electrical fields respectively. The influence of the emulsifying agent concentration during the particle preparation on the electrorheological (ER) effect of the fluid was studied. The results show that the ER effects are different under direct and alternating electrical fields. The ER effects of the γ-Fe2O3/lithium polyacrylate particles at some γ -Fe2O3 contents are stronger than that of the lithium polyacrylate especially under alternating fields. The contents of the crosslinking agent MBAM, the comonomer MA and the emulsifying agent cetyltrimethyl ammonium bromide influence the ER effects and the morphology of the composite particles. Copyright © 1999 John Wiley & Sons, Ltd.
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