| 초록 |
Electrospraying technology is used to generate interesting morphologies and narrow size distributions. The particle morphology and size of poly(methyl methacrylate) (PMMA) and polyurethane (PU) were investigated on processing parameters such as flow rate, voltage, or solvent volatility. The solvent volatility significantly affects the determination of particle morphology, i.e. hollow and porous collapsed PMMA particles in the case of solvents of below 80 ℃ (b.p.), cup-like particles between 80 and 130 ℃, high porous particles between 150 and 165 ℃, and smooth surface particles above 170 ℃. When PU (Tg: - 69 ℃) was electrosprayed with solvents of below 130 ℃ boiling point, the doughnut-like morphology is generated. These results confirm the existence of critical rates of solvent evaporation determining the doughnut, hollow, or cup-like particle fabrication. Particle size varies with changes in the concentration, flow rate, and the solvent evaporation. |
