What Is Ethylene Vinyl Acetate Copolymer

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What is ethylene vinyl acetate copolymer.

The major industrial route involves the reaction of ethylene and acetic acid with oxygen in the presence of a palladium catalyst. In addition poly vinyl acetate ethylene vae copolymers possess enhanced toughness flexibility and serviceability. The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe. Vinyl acetate is used to make other industrial chemicals such as polyvinyl acetate polymers and ethylene vinyl acetate copolymers.

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. 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. As the va content increases crystallinity decreases until at 50 the eva is. Many different grades are manufactured with the vinyl acetate content varying from 5 to 50 percent by weight.

Vinyl acetate is the acetate ester of vinyl alcohol. Ethylene vinyl acetate is a type of plastic a polymer with a wide variety of uses both residential and industrial. 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. It is an extremely elastic and tough thermoplastic of excellent clarity and gloss and with little odor.

Both effects result in a lowering of the tg of the final copolymer. Ethylene vinyl acetate copolymer eva for instance is produced by the copolymerization of ethylene and vinyl acetate under pressure using free radical catalysts. These other chemicals are used mostly to make glues for the packaging and building industries. The food and drug administration fda has determined that.

They are also used to make paints textiles and paper. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va. Eva has many attractive properties including low cost excellent adhesion to many polar and nonporous substrates good flex crack and. Ethylene vinyl acetate or eva is a copolymer of ethylene and vinyl acetate with a structure as shown below.

On a weight basis ethylene is far more effective a fact that is reflected in the low tg of polyethylene homopolymer below 80 c.