<p>The development of novel epoxy materials and the comparison of their thermal and thermomechanical properties, along with the correlation of these properties with their molecular structure, are of significant importance. Isothermal curing of two epoxy resins including ethylene glycol diglycidyl ether (EGDGE) and trimethylol propane triglycidyl ether (TMPTGE) with melamine curing agent was investigated. Differential scanning calorimetry (DSC) technique was used to ensure the approximate completion of curing reactions. The curing exotherms were completely removed from the DSC profiles of the two cured resins. The completion of the curing reactions was also confirmed by Fourier transform infrared (FTIR) spectroscopy. The prepared networks (denoted by EGDGE-Mel and TMPTGE-Mel) were also characterized by field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray (EDX) spectroscopy and X-ray diffraction (XRD). Some physicomechanical characteristics of the prepared networks such as density, Shore D hardness and elongation at break were also examined. The network obtained by curing the trifunctional epoxy resin, TMPTGE, had a hardness and elongation at break of 82 and 2%, respectively. Also, thermogravimetric analysis (TGA) of both epoxy networks showed a two-stage mass loss in the temperature ranges of 250–350 (≈ 55%) and 400–650&#xa0;°C (≈ 30%). Water uptake-time graph of EGDGE-Mel epoxy network showed a significant mass increase (up to 55%) after 48&#xa0;h.</p> Graphical abstract <p></p>