Poly(propene) and nylon are both synthetic polymers but are made by different types of polymerisation. Compare the types of polymerisation used to make poly(propene) and nylon, including the types of monomer involved and whether any small molecules are released.

Poly(propene) is produced by addition polymerisation of propene monomers, which contain a carbon–carbon double bond and are unsaturated. No small molecules are released during this process.

Nylon is produced by condensation polymerisation of diamine and dicarboxylic acid monomers, each of which has two reactive functional groups. During the reaction a small molecule, water, is released.

Thus, poly(propene) is made by addition polymerisation of unsaturated monomers with no loss of small molecules, whereas nylon is made by condensation polymerisation of bifunctional monomers with the release of water.