This study characterized the mechanical and thermal properties of the oligomer-based formulations of the diglycidyl ether of bisphenol A (DGEBA) cured with series aliphatic amines (triethylenetetramine (TETA), tetraethylenepentamine (TEPA) and O,O bis (2-aminopropyl propylene glycol) (Jeffamine D230) with different functionalities in the glassy state. Impact Izod and three-point bending tests were conducted to determine the networks' impact energy (E-i), elasticity modulus (E-y), yield stress (sigma(y)) and fracture toughness (K-IC) values. The same three-point bending mode was also employed to characterize the systems' thermomechanical properties (DMA) and storage modulus (E') and damping modulus (tan delta = E ''/E') values. The DGEBA/D230 network showed greater flexibility, maximum impact energy, higher fracture toughness, and a lower yield stress than the DGEBA/TETA and DGEBA/TEPA networks. The fracture behavior of these epoxy systems was correlated to the molecular weight between the crosslink points, M-c, and the plastic zone size (r(p)) at the crack tip carved in the samples. The DGEBA/D230 network had the highest storage modulus and tan d intensity, together with higher toughness and deformation during the network's fracture. These results were a consequence of the structural characteristics of comonomers, including their chain segment flexibility, molecular weight between crosslink points and functionality. (C) 2013 Society of Plastics Engineers