Inorganic hydroxyapatite (HAP) and its mixture with polyvinylalcohol (PVA) used as a dispersant system in styrene suspension polymerization

the effects of dispersed phase ratio

the concentration of HAP and stirring speed on the formation of polymer particle were examined experimentally. The characteristics of coalescence and breakup of droplets were analyzed in particular. The results showed that the growth of suspension styrene droplets was independent of the dispersing mechanism of stabilizer but was a process of coalescence and breakup of droplets. The growth of droplets could be controlled by adjusting the way of adding dispersant during polymerization. It was observed that droplet size distribution changed from single - peaked to bimodal distribution and then back to single - peaked distribution with the dispersant added in two batches. These results will help to produce suitably sized polymer particle with a narrower size distribution.