چكيده به لاتين
Epoxy resins are one the most used materials in engineering industries. However, epoxy resins are often in exposure to moisture which is detrimental to their mechanical characteristics. Also, in actual conditions, epoxies are often exposed to environmental conditions by varying the amount of moisture that these changes repeatedly occur. In this study, the effect of adding nano-GO, nano-Fe2O3 and a hybrid of both particles on the destructive effect of humidity fluctuates on the mechanical properties of epoxy resin that sunk in deionized water at 60oC condition saturation and drying at 60oC condition has been investigated. To this end, 0.25 and 0.5 wt% of solo GOs, 1 and 2 wt% of solo Fe2O3, a hybrid of 0.125 wt% of GOs and 0.5 wt% of Fe2O3 and a hybrid of 0.25 wt% of GOs and 1 wt% of Fe2O3 were dispersed in the epoxy. The results of the gravimetric test showed that the absorbed moisture content of the Fe2O3 nanocomposites in saturated and resaturated was lower than pure samples as well as in other samples. While this nanocomposites held the most moisture content in desorbed state. Also, the moisture diffusion coefficient of this nanocomposite was lower in all saturation and desorb states than the pure sample, while other nanocomposites had a higher diffusion coefficient than the pure epoxy. According to the results of the tensile test, the Improvement of the strength and modulus of elasticity of the Fe2O3 nanocomposites was higher than other nanocomposites.
