Molecular Weight Of Ethylene Vinyl Acetate

Other articles where ethylene vinyl acetate is discussed.

Molecular weight of ethylene vinyl acetate.

Ethylene vinyl acetate copolymer eva for instance is produced by the copolymerization of ethylene and vinyl acetate under pressure using free radical catalysts. As the va content increases crystallinity decreases until at 50 the eva is. There are three different types of eva copolymer which differ in the vinyl acetate va content and the way the materials are used. Ethylene vinyl acetate eva is a random copolymer of ethylene and varying amounts of vinyl acetate va.

Ethylene vinyl acetate polymer. 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. 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 is now the preferred feedstock for vam vinyl acetate monomer largely replacing the earlier acetylene based process.

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