| 초록 |
Core-shell structured poly(methyl methacrylate) (PMMA)/poly(n-methylaniline) (PNMA) composite particles were fabricated using a facile method and their electrorheological (ER) characteristics under an applied electric field were examined. Monodisperse PMMA nanoparticles were obtained using dispersion polymerization. After that, PNMA shell was coated by a chemical oxidative polymerization on the surface of PMMA which was modified by GMA, EGDMA and ODA as a swlleling, crosslinking, and grafting agent, respectively. The synthesized particles were analyzed by SEM, TEM, FT-IR and TGA. ER performance of the chain-like structure of the PMMA/PNMA microparticles observed by an optical microscopy. In addition, when dispersed these microparticles in silicone oil, their ER properties were investigated using a rotational rheometer to examine effects of electric field strength. The Cho-Choi-Jhon model was also used to describe their unusual flow curves for the entire shear rate region. |
