Suspensiopolümerisatsioon

Suspensiopolümerisatsioon is a polymerization process where monomers are dispersed as droplets in a continuous liquid phase, typically water. These monomer droplets are suspended by suspending agents, such as polyvinyl alcohol or hydroxyethyl cellulose, which prevent them from coalescing. Initiators are dissolved within the monomer droplets to initiate the polymerization reaction. The process is carried out under agitation to maintain the suspension. As polymerization proceeds, the monomers within each droplet convert into polymer particles, which remain suspended. The heat generated during polymerization is efficiently dissipated by the surrounding liquid phase, allowing for good temperature control. The final product consists of discrete polymer beads or granules. This method is commonly used for the production of polymers like polyvinyl chloride (PVC), polystyrene (PS), and polymethyl methacrylate (PMMA). The particle size and morphology of the resulting polymer can be controlled by factors such as the type and concentration of suspending agent, the speed of agitation, and the initiator concentration. Suspensiopolümerisatsioon offers advantages such as ease of heat removal, production of relatively pure polymers without the need for extensive solvent removal, and the ability to produce polymers with specific particle sizes.