Nylons are condensation copolymers formed by reacting equal parts of a diamine and a dicarboxylic acid, so that amides are formed at both ends of each monomer in a process analogous to polypeptide biopolymers. Chemical elements included are carbon, hydrogen, nitrogen, and oxygen.
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Nylon is not a copolymer. The only way that it could be construed to be a copolymer is that some types of nylons are made from a di-amine and a di-carboxylic acid. Another form may be made from a molecule containing both an amine functionality and an acid functionality. See your other question for the reaction. Copolymers are usually addition polymers that use two different kinds of monomers that will mix in the resultant polymer.