When Monomers with at least two functional groups react to form a polymer the process is called polyaddition.
Double bonds are separated to build new bonds.
Short and long chains react with each other.
The Polyaddition can take place at both ends of the arising chains.
Polyurethane, Polyureas and Epoxy resins are the most important products created through polyadditions.

Polyaddition in Injection Molding

Plastic: Polyaddition of Dialcohol and Diisocyanate to Polyurethane.

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This glossary of plastic industry is provided by PLEXPERT Canada Inc.