Thermally stimulated currents in epoxy resin systems and epoxy resin/rubber blends

The low temperature relaxation mechanisms of epoxy networks and blends were investigated by thermally stimulated discharge current (TSDG) techniques in the temperature range of 77 to 300 K. Two series of specimens, based on DGEBA cured with either TETA or DDM, were prepared. Specimens in the first series were mixed with different amounts of plasticizer thiocol. The influence of the absorbed water on the low temperature relaxations, and its plasticizing capability were studied, both affected by the presence of plasticizer and water in the specimens. In the second series, blends of CTBN with epoxy resin ER were prepared. Four dispersions are observed and ascribed to the CTBN phase, the ER phase and their interfaces.