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Polymerizability of Lactams

Abstract The ability of lactams to undergo ring-opening polymerization largely depends on the ring size, substitution and presence of heteroatoms in the lactam ring. The heat of polymerization varies with ring size from practically zero up to 20 kcal/mol. Also the entropy of polymerization can vary in a much broader range than for, e.g. vinyl monomers. Changes in the amide group conformation affect both the thermodynamic values and the reactivity of the amide group. Hence, the lactam family represents a very versatile group of monomers from the point of view of polymerizability as well as properties of the resulting polymer.