• curing of polymers;
  • dielectric properties;
  • fluoropolymers;
  • mechanical properties;
  • thermosets


We studied the effects of functional groups on the physicochemical properties, such as rheological behavior, thermal stability, glass-transition temperature, and electrical and mechanical properties, of 4,4′-diaminodiphenyl methane (DDM) cured methyl-substituted and trifluoromethyl-substituted difunctional epoxy resins [i.e., 2-diglycidylether of toluene (DGET) and 2-diglycidylether of benzotrifluoride (DGEBTF)]. The DGEBTF/DDM system showed higher thermal stability and lower dielectric constant values than the DGET/DDM system. The impact strength of the DGEBTF/DDM system was significantly higher than that of the DGET/DDM system. The increase in intermolecular interactions because of the increasing polarity of the fluorine in the epoxy backbone was probably the key to these results. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1860–1864, 2005