Molecular Weight Of Ethylene Vinyl Acetate

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Molecular weight of ethylene vinyl acetate.

The following pie chart shows world consumption of ethylene vinyl acetate. 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. Ethylene vinyl acetate polymer. Ethylene is now the preferred feedstock for vam vinyl acetate monomer largely replacing the earlier acetylene based process.

Vam is usually produced by the catalysed vapour phase reaction of acetic acid with ethylene and oxygen in a fixed bed tubular reactor using a supported noble metal catalyst. World eva capacity is projected to increase at an average annual rate of about 5 per year through 2023 while consumption is expected to increase at 4 per year over the same period. As the va content increases crystallinity decreases until at 50 the eva is. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va.

The va comonomer interferes with chain packing reducing crystallinity and thus lowering t m and improving transparency when compared with ldpe. Many different grades are manufactured with the vinyl acetate content varying from 5 to 50 percent by weight.