Spherical polymer particles depending on the size are widely utilized in many applications, such as biomedical applications, micro-electronics, standard particles for calibrating instruments, coatings, toners, fillers for chromatography columns, drug delivery materials, catalyst carriers, and so on....
Spherical polymer particles depending on the size are widely utilized in many applications, such as biomedical applications, micro-electronics, standard particles for calibrating instruments, coatings, toners, fillers for chromatography columns, drug delivery materials, catalyst carriers, and so on. In this study, dispersion polymerizations for the preparation of monodisperse micron-size polystyrene particles were carried out in the presence of AIBN as initiator, PVP as steric stabilizer and alcohol/water solution as solvent medium at 70 ℃ in N_(2) atmosphere, in order to investigate the effect of various reaction conditions, such as monomer content, molecular weight and concentration of stabilizer, temperature, concentration of initiator, and type of solvent medium, on particle size and dispersity. Then, seeded polymerizations of polystyrene particles prepared by the dispersion polymerization were conducted in isopropanol medium, where the effect of agitation speed and monomer type on particle size and dispersity were analyzed. Finally, a process was attempted to produce composite particles composed of metallic copper coated on the surface of the polymer particle already prepared. The effect of aging time and stabilizer content on copper coating on the surface of polymer particles were examined. The particle size prepared by dispersion polymerization increased with increasing temperature and initiator concentration, but decreased with increasing concentration and molecular weight of stabilizer. In the seeded polymerization, it was confirmed that the particle size increased with the proper removal of acetone. With copper coated polymer particles, the coating efficiency was increased with aging time and stabilizer content.
Spherical polymer particles depending on the size are widely utilized in many applications, such as biomedical applications, micro-electronics, standard particles for calibrating instruments, coatings, toners, fillers for chromatography columns, drug delivery materials, catalyst carriers, and so on. In this study, dispersion polymerizations for the preparation of monodisperse micron-size polystyrene particles were carried out in the presence of AIBN as initiator, PVP as steric stabilizer and alcohol/water solution as solvent medium at 70 ℃ in N_(2) atmosphere, in order to investigate the effect of various reaction conditions, such as monomer content, molecular weight and concentration of stabilizer, temperature, concentration of initiator, and type of solvent medium, on particle size and dispersity. Then, seeded polymerizations of polystyrene particles prepared by the dispersion polymerization were conducted in isopropanol medium, where the effect of agitation speed and monomer type on particle size and dispersity were analyzed. Finally, a process was attempted to produce composite particles composed of metallic copper coated on the surface of the polymer particle already prepared. The effect of aging time and stabilizer content on copper coating on the surface of polymer particles were examined. The particle size prepared by dispersion polymerization increased with increasing temperature and initiator concentration, but decreased with increasing concentration and molecular weight of stabilizer. In the seeded polymerization, it was confirmed that the particle size increased with the proper removal of acetone. With copper coated polymer particles, the coating efficiency was increased with aging time and stabilizer content.
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