Ethylene Vinyl Acetate Eva And Polyurethane

Eva foam is also waterproof.

Ethylene vinyl acetate eva and polyurethane. Eva is a polyolefin copolymer of ethylene and vinyl acetate that provides durability and flexibility making it the most commonly used material found in athletic shoe midsoles. Polymerization leads to vae copolymers. Novel blends based on ethylene vinyl acetate thermoplastic polyurethane eva tpu at different ratios were prepared via the melt blending technique. While most polyurethanes are thermosetting polymers that do not melt when heated thermoplastic polyurethanes are also available.

This product should not be confused with the ethylene vinyl acetate eva. Polyurethane polymers are traditionally and most commonly formed by reacting a di or triisocyanate with a polyol since polyurethanes contain two types of. Laminated glass is a type of safety glass that holds together when shattered in the event of breaking it is held in place by an interlayer typically of polyvinyl butyral pvb ethylene vinyl acetate eva or thermoplastic polyurethane tpu between its two or more layers of glass. Vae copolymers form the basis for engineering different properties in the individual end application.

Abstract ethylene vinyl acetate copolymer thermoplastic polyurethane eva tpu blending foams are rarely reported so far because of their poor compatibility and addition of a compatibilizer to the blend system was our major interest which can improve interfacial adhesion between the two phases. The food and drug administration fda has stated that ethylene vinyl acetate is safe when used in food production packaging or transportation and it s not an especially dangerous material. Eva mats will have a glossy appearance and are resistant to uv radiation and cracking. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used.

Although the synthetic polymer is a useful material for the athletic shoe industry it has become an environmental concern because of its poor biodegradability. Vinyl acetate ethylene vae emulsions are based on the copolymerization of vinyl acetate and ethylene in which the vinyl acetate content can range between 60 and 95 percent and the ethylene content ranges between 5 and 40 percent of the total formulation. The interlayer keeps the layers of glass bonded even when broken and its high strength prevents the glass. Scanning electron microscopy sem studies revealed primarily a two phase morphology in which the minor tpu phase was dispersed in the major continuous eva matrix.

Ethylene vinyl acetate or eva material is an elasticized closed cell foam with rubber like softness and flexibility. Vinyl acetate ethylene vae is a combination of ethylene and vinyl acetate two monomers possessing special properties as e g. While the eva foam does not contain any rubber is is commonly referred to as expanded rubber or foam rubber. Ethylene vinyl acetate eva also known as poly ethylene vinyl acetate peva is the copolymer of ethylene and vinyl acetate the weight percent of vinyl acetate usually varies from 10 to 40 with the remainder being ethylene.