Polyaddition is a type of chemical reaction in which monomers with multiple reactive functional groups react to form a polymer without the elimination of any small molecules. This process typically involves the stepwise addition of monomer units, each containing at least two reactive sites, leading to the formation of a high molecular weight polymer.
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Polyaddition is step-growth polymerization by joining reactions without elimination of small molecules. Compatible functional groups on different chain lengths remain eligible to join; the word addition alone does not imply chain-growth polymerization.[ref]