Thermoanalytical studies on the curing of epoxy resin under the action of aqueous solutions of heteropolyacids of tungsten and molybdenum

By means of DSC, DTA, TG and NMR it was established that the process of cure of epoxy resins induced by aqueous solutions of heteropolyacids consists of two stages, the first one being connected with a catalytic interaction between oligomer and water, and the second one with epoxy-hydroxyl etherification. Analysis of kinetic data shows that the first reaction is diffusion controlled, the second process can be described by pseudo-first order kinetics with activation energy about 40 kJ/M.The authors thank Dr. A. E. Chalykh for the help in our work.