| 학회 | 한국공업화학회 |
| 학술대회 | 2005년 가을 (10/28 ~ 10/29, 건국대학교) |
| 권호 | 9권 2호 |
| 발표분야 | 콜로이드,계면화학 |
| 제목 | Utilization of an Amphoteric Initiator in Dispersion Polymerization for The Preparation of Monodisperse Polystyrene Microspheres |
| 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 mm/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 | 심상은 |
| 소속 | Department of Chemical Engineering |
| 키워드 | Monodisperse Polystyrene Microspheres |
