The curing characteristics of adicyandiamide-cured epoxy system under the influence of solvents in a closed environment were
studied by means of isothermal differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR).
The DSC analyses revealed that the presence of solvent results in decreases in the curing exotherm, the initial curing rate,
the glass transition temperature, the reaction rate and the reaction order of the epoxy resin. The greatest decreases were
caused by the solvent with the highest boiling temperature. A change in temperature-dependent curing route due to the heat
absorbed during solvent evaporation is responsible for the difference. The FTIR analyses confirmed that the composition of
the cured resin is affected by the solvent, the curing temperature and the specimen configuration. As compared with those
obtained from open systems, specimens produced in a closed environment have an enhanced curing exotherm, initial curing rate,
glass transition temperature, reaction rate and reaction order because of the retention of volatile catalytic by-products.