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emulsion polymerization
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A three-stage diagram shows the emulsion-polymerization process: monomer droplets, free-radical initiators, and surfactant molecules are added to a water bath; surfactants form micelles around monomers before polymerization; and, after polymerization, latex particles are suspended in the water. Labels identify key components and the transformation from monomer to latex particle.
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emulsion polymerization

chemistry
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A three-stage diagram shows the emulsion-polymerization process: monomer droplets, free-radical initiators, and surfactant molecules are added to a water bath; surfactants form micelles around monomers before polymerization; and, after polymerization, latex particles are suspended in the water. Labels identify key components and the transformation from monomer to latex particle.
Figure 1: Schematic diagram of the emulsion-polymerization method. Monomer molecules and free-radical initiators are added to a water-based emulsion bath along with soaplike materials known as surfactants, or surface-acting agents. The surfactant molecules, composed of a hydrophilic (water-attracting) and hydrophobic (water-repelling) end, form a stabilizing emulsion before polymerization by coating the monomer droplets. Other surfactant molecules clump together into smaller aggregates called micelles, which also absorb monomer molecules. Polymerization occurs when initiators migrate into the micelles, inducing the monomer molecules to form large molecules that make up the latex particle.

Emulsion polymerization is a widely used industrial method for creating vinyl polymers. It involves creating a stable emulsion of a monomer in water, using a soap or detergent as an emulsifying agent. Free-radical initiators in the water migrate into stabilized monomer droplets called micelles, initiating polymerization. This process allows for very high molecular weights to be achieved because the reaction only terminates when a second radical enters a swelling micelle. A key advantage is that the reaction heat is effectively dispersed in the water phase. While the formulation can be complex, it's ideal for applications where the polymer is used as an emulsion, such as in latex paints and adhesives.12

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2 Britannica Sources
  1. chemistry of industrial polymers - Emulsion polymerization
  2. surface coating - Step-growth and chain-growth polymers

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