Abstract
Epoxy network systems were prepared based on diglycidyl ether of bisphenol A with two kinds of low molecular weight polysiloxane, aminopropyldimethyl-terminated polysiloxane and phenyl-terminated polysiloxane. Their physical ageing phenomena were studied by differential scanning calorimetry. The calorimetric data obtained after annealing the neat and the modified cured epoxy resins at 175°C show that two kinds of relaxation—internal stress relaxation and enthalpy relaxation-take place simultaneously during annealing. Furthermore, the extent and the rate of relaxation are closely related to the kind of modifiers and their ratio.
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