Magnetorheological fluids using iron composite with poly(methyl methacrylate)

초록

Composite particles (CIPMMA) of carbonyl iron (CI) and poly (methyl methacrylate) (PMMA) were prepared by a suspension polym-erization method using CI dispersions in MMA monomer, and these were adopted as dispersed phase of magnetorheological (MR) fluids. The CIPMMA can resolve several problems of MR fluids having CI alone such as severe sedimenta-tion and poor dispersion stability. Flow and vis-coelastic properties of the MR fluids were ana-lyzed via a rotational rheometer equipped with a magnetic field supplier using a parallel plate geometry. The MR characteristics including a yield stress were affected by the CI contents in the composite particles.