The Dicyandiamide Cure of SP-250 Epoxy Resin Accelerated by Monuron.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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The synergistic effect of dicyandiamide and Monuron which takes place in the hardening of epoxy resins was investigated by differential scanning calorimetric analysis conducted under dynamic conditions. The cure behavior was illustrated by the examination of three distinct systems SP-250 epoxy resin dicyandiamide Dicy, resin DicyMonuron, and resin Monuron. The activation energies of these systems were found to be 39, 22, and 19 kcalmole, respectively. The by-product of the resin Monuron reaction is dimethylamine and it was found that this amine is able to enhance the reactivity of dicyandiamide dramatically. Mixtures pertinent to the SP-250 formulation were examined and the interpretation of the thermal data afforded certain speculations. Author
- Physical Chemistry