What defines an addition polymer?

An addition polymer is defined as a large molecule that is formed by the direct addition of many small molecules, specifically monomers that contain double bonds. During the polymerization process, these double bonds are broken to allow the monomers to link together in a chain-like structure, resulting in a long polymer molecule. This process is known as addition polymerization and does not involve the elimination of any small molecules, such as water or carbon dioxide, which is a key distinction from condensation polymers.

The presence of double bonds in the monomers is crucial, as it enables the chemical reaction that leads to the formation of the polymer. This characteristic differentiates addition polymers from other types of polymers, such as those formed through condensation reactions, where small molecules are released during the formation of the larger structure. Thus, the statement highlights the fundamental nature of addition polymers involving the addition of unsaturated monomers and the breaking of double bonds to form stable single bonds in the polymer chain.