چكيده به لاتين
Researchers have proposed various methods to reduce the penetration of moisture into the epoxy resin. Researchers use different methods to influence the amount of moisture absorption, One of these methods is the use of nanoparticles or nano-sheets. Carbon nanotubes and carbon nanosheets have received special attention in this field due to their unique physical and chemical properties. This paper presents the use of an alternating-current electric field to align grapheme oxide nanosheets in a resin epoxy. Orientation of graphene oxide nanosheets has been done in different ways, including orientation in one direction or two directions. Nanocomposites have been investigated in weight percentages of 0.1, 0.3 and 0.5 wt% of graphene oxide nanoplates in random and oriented position. Orientation and placement of graphene oxide nanosheets can significantly affect the absorption of moisture into nanocomposites. Addition of 0.1, 0.3 and 0.5 wt% of graphene oxide nanosheets with random placement compared to the pure epoxy resin sample reduced the moisture absorption by 20, 25 and 16%, respectively. However, in samples containing 0.1, 0.3 and 0.5 wt% of graphene oxide nanosheets, if the direction of moisture absorption is in the same direction as the direction of electric field application. Moisture absorption decreases by 43%, 48% and 33%, respectively, compared to the pure sample of epoxy resin. As a result, the proper positioning and orientation of graphene oxide nanosheets can have a special effect on moisture absorption inside nanocomposites. Finally, using electron microscopy, images of the fracture surface of nanocomposites and the position of graphene oxide nanoplates are shown.