Abstract
AbstractWith the plate method we determined dynamically the surface tension of different epoxy‐amine systems. After different critical observations about the validity of this type of measurement during the reaction time, we were able to correlate the evolution of the surface tension with epoxy conversion. For epoxy systems based on cycloaliphatic diamines, the diamine is the low energy component in the monomer blend. As the diamine reacts, its concentration in the bulk decreases, the surface is improverished in surfactant, and the surface tension of the reactive system increases. A constant value is obtained when all the diamine monomer has been consumed. The final surface tension of a fully cured epoxy system without additive can be higher than any of the surface tensions of the initial reactants. But for rubber‐modified epoxy systems, the rubber is the component with the lowest surface energy, the surface properties of the reactive system are independent of the reaction time and very close to the surface properties of the rubber.
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