etylvinylacetat

Etyvinylacetat, commonly abbreviated as EVA, is a copolymer of ethylene and vinyl acetate. It is a type of polymer that combines the properties of both polyethylene and polyvinyl acetate. The ratio of ethylene to vinyl acetate in the polymer chain can be varied, which allows for a wide range of properties and applications. Generally, as the vinyl acetate content increases, the polymer becomes more flexible, transparent, and adhesive.

EVA is known for its toughness, flexibility, and elasticity, even at low temperatures. It also exhibits good resistance to UV radiation and impact. Its low density makes it a lightweight material. EVA is produced through polymerization processes, typically using free radical polymerization. The resulting polymer can be processed using standard thermoplastic techniques such as injection molding, extrusion, and blow molding.

Common applications for etylvinylacetat include footwear, where it is used in shoe soles for its cushioning and shock-absorbing properties. It is also found in hot-melt adhesives, flexible films, wire and cable insulation, and as a foam material in sports equipment and toys. Its non-toxic nature and good adhesion make it suitable for food packaging and medical devices. EVA is also utilized in the production of synthetic leather and as a sealant.