| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.158 |
| 발표분야 | 고분자 합성 |
| 제목 | Effects of reaction conditions on the micron-sized particles by dispersion polymerization of styrene |
| 초록 | Monodisperse polymer particles of micron-size are useful in various areas, such as particles for biomedical analyses, spacers of LCD panels, standard particles for calibrating instruments, carrier particles for liquid chromatography columns, and so on. The production of well-defined particles largely depends on three types of polymerization techniques. Suspension polymerization is used to produce relatively large particles with a broad size range of 0.1 to 2 mm, but this technique is ineffective for achieving monodisperse particles because of the inherent nonuniform in mechanical dispersions. Emulsion polymerization is usually adopted to produce particles in the submicron size. To obtain micron-sized particles, multistep seeded emulsion polymerization may be applied, but this approach is time-consuming and thus hard to apply to industrial scale. Dispersion polymerization is a versatile method for the preparation of monodisperse polymer particles in the size range of 0.5 to 10 micrometers with a single step. However, the studies on various reaction conditions including MW of stabilizer, stabilizer content, initiator content, temperature, crosslinking agent content, solvent medium composition, solvent medium content and diluent content, have not fully been reported in open literatures, because dispersion polymerization is highly sensitive to the small changes of various reaction parameters. In this study, a model formulation for the preparation of micron-sized particles by dispersion polymerization of styrene is considered to investigate the effects of various reaction conditions on particle size. Materials used in standard system were styrene as monomer, polyvinyl pyrrolidone as polymeric stabilizer, 2,2’-azoisobutyronitrile as initiator and ethanol/water solution as solvent medium, and this system was maintained at the agitation speed of 80 rpm and the polymerization temperature of 70 degree C. The conversion of dispersion polymerization of styrene was measured gravimetrically by taking out samples at different time intervals. The morphology of the polymerized particles was observed by optical microscopy and scanning electron microscopy. The average particle size and size distribution were measured with laser particle size analyzer. Good tendency was found for the size and monodispersity of polystyrene particles depending on individual reaction condition. |
| 저자 | 황선웅, 이성재 |
| 소속 | 수원대 |
| 키워드 | monodisperse particle; dispersion polymerization; particle size |
