Chemical structure of networks resulting from curing of N,N‐diglycidylaniline‐type resins with aromatic amines. II. Detection and characterization of intermolecular etherification on model compounds

The reactivity of model compounds representative of the structures resulting from the first steps of curing in uncatalyzed (or LiClO4‐catalyzed) N,N‐diglycidylaniline/aromatic amine systems was studied. The results indicate that the intermolecular etherification either does not occur or is very slow under these conditions. Moreover, the latter situation is observed only in the very specific configuration when two hydroxyl groups are very close to each other. From these experiments, it can be inferred that the most likely reactions occurring after the epoxy‐primary amine addition in uncatalyzed N,N‐diglycidylaniline/aromatic amine systems are the are the epoxy‐secondary‐amine addition and the cyclization reactions discussed in a previous paper.