| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 합성 |
| 제목 | Synthesis of Highly Monodisperse Polystyrene Microspheres via Dispersion Polymerization Using an Amphoteric Initiator |
| 초록 | The highly monodisperse polystyrene (PS) microspheres were produced by dispersion polymerization using an amphoteric initiator, 2,2’-azobis [N-(2-carboxyethyl)-2-2-methylpropionamidine] (VA-057). The polymerization characteristics were investigated and compared with conventional initiators, AIBN and BPO. The monodisperse PS microspheres are obtained at very low stabilizer, poly(vinyl pyrrolidone) (PVP) concentrations of 1 and 2 wt%. The microspheres are extraordinarily monodisperse (Cv values all less than 4 %). The uniformity of particles was characterized employing an optical analyzer, Turbiscan. For the VA-057 system, the back scattering intensity is linearly reduced with time having a constant the sedimentation rate of 48.98 μm/min throughout the settling process. The uniformity of PS particles in the VA-057 system stems from the higher rate of polymerization in early stage of polymerization, followed by significantly faster reduction of the rate. Therefore, it is found that the use of an amphoteric initiator, VA-057, is promising in dispersion polymerization in the fact that the polymerization becomes insensitive to the reaction conditions and smaller amount of stabilizer is necessary for producing monodisperse particles. |
| 저자 | 이정우, 심상은 |
| 소속 | 인하대 |
| 키워드 | dispersion polymerization; polystyrene; amphoteric initiator |
