A detailed study investigating the relation between the initial resin composition and mixing ratio on the viscoelastic behavior was performed. The resin system, containing a difunctional aromatic epoxy (DER 332), was mixed with three aliphatic amines containing functionalities of 2, 3, and 4 in different stoichiometric mixing ratios and was cured. For each of the cured mixtures, the viscoelastic master curve and corresponding shift factors were determined. Depending on the crosslink density, the viscoelastic curves shifted by about 12 decades with respect to the frequency scale. This shift in the viscoelastic curve was predicted by the combination of the Miller-Macosko theory for crosslink density with a parameterized Havriliak-Negami model for the master curve. A single set of 9 parameters turned out to be sufficient to describe all viscoelastic data. (c) 2008 Wiley Periodicals, Inc.