Surfactants, or surfactants, are additives that reduce the surface tension between two phases, such as a liquid and a solid or two immiscible liquids. In polymer processing, surfactants are used as wetting agents, dispersants, and emulsifiers to improve the uniformity and dispersion of fillers, pigments, and other additives in the polymer matrix. They play a vital role in the manufacture of composites, coatings, and adhesives, ensuring proper wetting and adhesion of the polymer to the substrate. Surfactants also affect the rheological properties of the polymer, affecting its flow behavior during processing. Common surfactants used in polymer additives include anionic, cationic, nonionic, and amphoteric surfactants, each with its own unique properties and applications.