Condensation polymer

Condensation polymers are polymers that form through the elimination of a small molecule, usually water, when pairs of monomer molecules join together. Usually it involves a reaction between two different monomers, but can occur where a molecule contains two different functional groups. [two most common types of condensation polymerisation – carboxylic acid group + alcohol/amine group]

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reactants: carboxylic acid groups on left, amine groups on right; products: water is eliminated