Fig. 1: Molecular structure of the model reactants. (a) Diacetone acrylamide pendant groups on the polymer backbone; (b)
adipic dihydrazide crosslinker; (c) 2-heptanone, modeling the ketone group in the diacetone acrylamide pendant group; and
(d) octanoic hydrazide, modeling the amine group in adipic dihydrazide. Reaction between 2-heptanone (c) and octanoic
hydrazide (d) could yield option (1), an enamine, and/or option (2), an imine