Preparation and Studies of Monodisperse PS/PAA Polymer Microsphere

Monosize polystyrene (PS) microspheres were prepared by dispersion polymerization, which had a very narrow particle-size distribution. The influence factors, such as initiator, monomer and stabilizer concentrations, polarity of reacting media on the size and size distribution of polystyrene microspheres were investigated, and the reacting mechanism was also discussed. Monosize PS microsphere in the size rang of 1. 0- 3. 0μm could be obtained by changing different reacting conditions. The best PS microsphere obtained was used as a seed to prepare the core-shell polymer microsphere through free-soap emulsion, which carriess functional group(carboxyl) and has good monodispersity . Its average size was 2. 50μm and average acid value was 10. 27 mg NaOH/g. The incorporation of carboxyl to the surface was confirmed by FTIR and element analyzer.