Ethylene-vinyl acetate

Ethylene-vinyl acetate

Names
Other names Poly(ethylene-vinyl acetate); Poly(ethylene-co-vinyl acetate); Polyethylene-vinyl acetate copolymer
Identifiers
CAS Number	24937-78-8 Y
Abbreviations	EVA; PEVA
PubChem	32742
UNII	4OKC630HS6 Y
Properties
Chemical formula	(C2H4)n(C4H6O2)m
Molar mass	Variable
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

a close-up picture of open celled EVA

"PEVA" redirects here. For the journal, see Performance Evaluation.

EVA polymer milk

Ethylene-vinyl acetate (EVA), also known as poly(ethylene-vinyl acetate) (PEVA), is the copolymer of ethylene and vinyl acetate. The weight percent vinyl acetate usually varies from 10 to 40%, with the remainder being ethylene.

EVA is an elastomeric polymer that produces materials which are "rubber-like" in softness and flexibility. This is distinct from a thermoplastic, in that the material is cross-linked, and thus difficult to recycle. The material has good clarity and gloss, low-temperature toughness, stress-crack resistance, hot-melt adhesive waterproof properties, and resistance to UV radiation. EVA has a distinctive vinegar-like odor and is competitive with rubber and vinyl products in many electrical applications.

Applications

Hot melt adhesives (such as hot glue sticks) and top of the line soccer cleats are usually made from EVA, usually with additives like wax and resin. EVA is also used as a clinginess-enhancing additive in plastic wraps. Craft foam sheets are made of EVA and are popularly used for children's foam stickers.

EVA is also used in biomedical engineering applications as a drug delivery device. The polymer is dissolved in an organic solvent (e.g., dichloromethane). Powdered drug and filler (typically an inert sugar) are added to the liquid solution and rapidly mixed to obtain a homogeneous mixture. The drug-filler-polymer mixture is then cast into a mold at −80 °C and freeze dried until solid. These devices are used in drug delivery research to slowly release a compound. The polymer does not biodegrade within the body, but is quite inert and causes little or no reaction following implantation.

EVA is one of the materials popularly known as expanded rubber or foam rubber. EVA foam is used as padding in equipment for various sports such as ski boots, bicycle saddles, hockey pads, boxing and mixed martial arts gloves and helmets, wakeboard boots, waterski boots, fishing rods and fishing reel handles. It is typically used as a shock absorber in sports shoes, for example. It is used for the manufacture of floats for commercial fishing gear such as purse seine (seine fishing) and gillnets. In addition, because of its buoyancy, EVA has made its way into non-traditional products such as floating eyewear. It is also used in the photovoltaics industry as an encapsulation material for crystalline silicon solar cells in the manufacture of photovoltaic modules. EVA slippers and sandals are popular, being lightweight, easy to form, odorless, glossy, and cheaper compared to natural rubber. In fishing rods, EVA is used to construct handles on the rod-butt end. EVA can be used as a substitute for cork in many applications.

EVA emulsions are polyvinyl acetate (PVAc) copolymers based on vinyl acetate (VAM) internally plastized with vinyl acetate ethylene (VAE). PVAc copolymer are adhesives used in packaging, textile, bookbinding for bonding plastic films, metal surfaces, coated paper and as redispersible powders in plasters and cement renders.

EVA is also used in coatings formulation of good quality interior water-borne paints at 53% primary dispersant

Hydrolysis of EVA gives ethylene vinyl alcohol (EVOH) copolymer.

Other uses

EVA is used in orthotics, fire safe cigarettes (FSC), surfboard and skimboard traction pads, and for the manufacturing of some artificial flowers. It is used as a cold flow improver for diesel fuel and a separator in HEPA filters. EVA can easily be cut from sheets and molded to shape. It is also used to make thermoplastic mouthguards that soften in boiling water for a user specific fit. It is also used for conditioning and waterproofing leather. Additional uses are in the making of nicotine transdermal patches since the copolymer binds well with other agents to form gel like substances.

External links

• List of EVA tradenames
• Acetic acid, ethenyl ester, polymer with ethene in the ChemIDplus database