| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.278 |
| 발표분야 | 기능성 고분자 |
| 제목 | Preparation of Electrorheological characterization PANI Coated PMMA Microsphere by Graft Polymerization |
| 초록 | ER fluids in general are suspensions of dielectric particles in a medium such as nonconducting liquids. They exhibit drastic changes in their rheological properties, including a large increase in their apparent viscosity and a formation of reversible suspension microstructures with an applied electric field. the ER performance critically depends on the electrical properties of the suspended particles. As a dispersed phase of an ER fluid, surface conducting particles with an acrylic polymer core (PMMA) and polyaniline (PA) shell were synthesized. The PMMA particles were dispersed in water containing sodium dodecylsulfate (SDS), and aniline was added to this suspension of PMMA. The suspension was acidified by HCl, and the polymerization started with addition of ammonium peroxysulfate initiator. To improve the core/shell particles of PMMA/PA, we introduced a grafting polymerization method of PA on surface of acrylic microspheres having aniline moieties (PA-g-PMMA). Microshperes having glycidyl functional groups were prepared using glycidyl methacrylate and PMMA seed through a seeded emulsion method. And then, aniline functionalities were introduced on the particle surface via a reaction between glycidyl group and dianiline reagent such as oxydianilne. Finally, aniline was polymerized within an aqueous acidic medium with microspheres having aniline functional groups. The particles were then dried and dispersed in silicone oil to make an ER fluid. ER fluids were characterized by a rotation-type rheometer equipped with a high voltage generator. PAPMMA suspensions showed typical ER behaviors such that the suspensions exhibit Bingham fluid behavior giving yield stress under an externally applied electric field. By applying electric fields, the shear stresses increase within the whole shear rate demonstrating a yield stress with a plateau region of shear stress. |
| 저자 | 이일상, 최형진 |
| 소속 | 인하대 |
| 키워드 | Polyaniline; PMMA microsphere; Electrorheology |
