Nylon is a copolymer of the amino acid Glycine (H2N-CH2-COOH) and aminocaproic acid [H2N(CH2)5COOH]. Glycine and aminocaproic acid combine in the following way.

In this structure, one molecule of Nylon can join another by intermolecular H –bonding which is present between two terminal groups –C=O and –NH. Since intermolecular H –bonding is relatively strong, it can lead to close packing of chains that impacts the crystalline character of Nylon.