What material is eva?

ethylene-vinyl acetate * * * polymer.

in the field of chemistry and organic chemical engineering, EVA refers to "ethylene-vinyl acetate * * * polymer" and its rubber-plastic foaming material, with the molecular formula of (C2H4)x.(C4H6O2)y, which is used to make refrigerator pipes, gas pipes, civil engineering plates, containers and daily necessities.

The performance of p>EVA is closely related to the content of vinyl acetate (VA). When the content of VA increases, its resilience, flexibility, adhesiveness, transparency, solubility, stress cracking resistance and impact resistance will all improve. When the content of VA decreases, the rigidity, wear resistance and electrical insulation of EVA will increase. Generally speaking, when the VA content ranges from 1% to 2%, it is a plastic material, while when the VA content exceeds 3%, it is an elastic material.

Extended information:

There are basically two types: the first type is linear structure, and the polymer compound with this structure is called linear polymers compound; The second is the bulk structure, and the polymer compound with this structure is called bulk polymer compound. Some polymers have branched chains, which are called branched polymers and belong to linear structure. Although some polymers are crosslinked between molecules, they are less crosslinked, which is called network structure and belongs to body structure.

two different structures show two opposite performances. Linear structure, melting when heated, less hardness and brittleness. The body structure is hard and brittle. Plastics have two kinds of polymers, one is thermoplastic made from linear polymers, and the other is thermosetting plastic made from bulk polymers.

Reference: Baidu Encyclopedia -EVA