Fariba Jafari-soghieh - School of Chemistry, Damghan University, ۳۶۷۱۵-۳۶۴, Damghan, Iran
Hossein Behniafar - School of Chemistry, Damghan University, ۳۶۷۱۵-۳۶۴, Damghan, Iran

Epoxy resins are widely applied as adhesives [1], coatings and matrix in polymer composites due to its low viscosity, good insulating properties even at high temperatures and good chemical and thermal resistance. However, most of the epoxy systems are brittle [2]. A variety of approaches have been proposed to enhance the epoxy systems mechanical and thermal properties. In this regard incorporation of nanofillers in to the epoxy systems has drawn a special attraction [3].In this article , we studied effect of surface- modified SiO2 nanoparticles and surface- modified magnetic iron oxide nanoparticles on improving thermal and mechanical properties of DGEBA/IPD epoxy networks.The resulting epoxy/ SiO2 nanocomposites and epoxy/Fe3O4 nanocomposites are thoroughly characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM) techniques, thermogravimetric analysis (TG/DTG), differential thermal analysis (DTA) and dynamic mechanical thermal analysis (DMTA) measurements. Fig. 1 shows FE-SEM of epoxy/Fe3O4 compared to epoxy/ SiO2 nanocomposites