Ethylene Vinyl Acetate Copolymer Uses

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Ethylene vinyl acetate is a type of plastic a polymer with a wide variety of uses both residential and industrial.

Ethylene vinyl acetate copolymer uses.

27 29 however due to its polarity only solutions. Since vinyl alcohol is highly unstable with respect to acetaldehyde the preparation of vinyl acetate is more complex than the synthesis of other acetate esters. In addition poly vinyl acetate ethylene vae copolymers possess enhanced toughness flexibility and serviceability. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va.

This review examines the breadth of eva use in drug delivery and will aid the researcher in locating key references and experimental results as well as understanding the features of eva as a highly versatile biocompatible polymer for drug. Eva ethylene vinyl acetate this copolymer resin can be used in adhesives sealants and coatings. Eva is used in several applications thanks to the varied properties it possesses. The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe.

It shows good chemical resistance. Vinyl acetate is the acetate ester of vinyl alcohol. 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. Eva shows good barrier and stretch properties.

On a weight basis ethylene is far more effective a fact that is reflected in the low tg of polyethylene homopolymer below 80 c. As the va content increases crystallinity decreases until at 50 the eva is. Ethylene vinyl acetate eva copolymers ethylene vinyl acetates are leading polymers for hot melt manufacturing due to their high versatility. Both effects result in a lowering of the tg of the final copolymer.

The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used. It is the basis of many hot melt adhesives when blended with a petroleum wax and a resin tackifier. Ethylene vinyl acetate offers good low temperature flexibility.

The significance and features of ethylene vinyl acetate eva copolymers in initial research and development led to commercial drug delivery systems. 26 eva copolymers usually comprising a vinyl ester content of 15 40 have been identified to be effective flow improvers for crude oils and middle distillates. 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. Incorporating ethylene vinyl acetate eva copolymer in the pama is also another modification strategy which is useful in the heavy fuel or crude oil flow improver application.

Ethylene vinyl acetate properties ethylene vinyl acetate is a flexible and transparent thermoplastic.

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