Fabrication and Magnetorheological Characteristics of Core-Shell-Typed Poly(2-Methylaniline)/Carbonyl Iron Microspheres

Core-shell particles of the poly-2-methylaniline (PMAN)/carbonyl iron (CI) composite material were prepared by dispersion polymerization. Dopamine was used as a chemical grafting agent to modify the surface of CI particles to enhance the affinity between PMAN particles and pure CI particles. The morphology and crystalline structure of the prepared core-shell PMAN/CI microspheres were tested by TEM and X-ray diffraction, respectively. Their magnetic behaviors were analyzed using a vibrating-sample magnetometer. The sedimentation stability of the particles was further analyzed using a Turbiscan analyzer. The analysis results revealed that the dispersion stability of the particles was better than that of the pure CI particles. The characteristics of the PMAN/CI particle-based magnetorheological fluid with a yield stress of 4800 Pa at 342 kA/m were measured using a rheometer.

Automated summary

Core-shell particles consisting of poly-2-methylaniline (PMAN) and carbonyl iron (CI) were successfully prepared through dispersion polymerization. The surface of CI particles was modified using dopamine as a chemical grafting agent to enhance the affinity between PMAN particles and pure CI particles. The morphology, crystalline structure, magnetic behaviors, and sedimentation stability of the prepared PMAN/CI particles were studied, and the dispersion stability was found to be better than that of pure CI particles. The characteristics of the PMAN/CI particle-based magnetorheological fluid were measured using a rheometer.