suspensioonipolümerisatsioonides

Suspension polymerization is a free-radical polymerization technique where the reaction takes place in discrete monomer droplets dispersed in a continuous liquid phase. The monomer, initiator, and any other soluble additives are suspended in a liquid, typically water, which is immiscible with the monomer. Agitation is crucial to maintain the fine dispersion of monomer droplets and prevent them from coalescing. Stabilizing agents, such as inorganic salts or fine polymeric particles, are often added to the continuous phase to prevent droplet aggregation and ensure the formation of stable polymer beads. The polymerization occurs within each individual monomer droplet, which acts as a miniature bulk polymerization reactor. As the polymerization proceeds, the monomer is converted into polymer, forming solid polymer beads. These beads are then separated from the continuous phase, washed, and dried. Suspension polymerization is widely used for the production of various polymers, including polyvinyl chloride (PVC), polystyrene (PS), and polymethyl methacrylate (PMMA). The process allows for good control over particle size and morphology, and the polymer beads are generally easy to handle and process further. The continuous phase helps to dissipate the heat generated by the exothermic polymerization reaction, leading to better temperature control compared to bulk polymerization.