Study On The Properties Of Unsaturated Polyster Resin/Graphene Nanocomposites Prepared Via Ball Milling

In this paper, unsaturated polyster resin/graphene nanocomposites have beenprepared by ball milling, the mechanical properties, eletrical and thermalconductivities of these nanocomposites as a function of the filler loading are discussed.The influence of ball milling time on electrical and thermal conductivities of thenanocomposites also been studied. The main points of this experiment are as follows:(1) The graphite can be exfoliated into graphene by ball milling, the graphene in theunsaturated polyester resin(UPR)/graphene nanocomposites are less than5layer.(2) With the help of ball milling method, graphene nanosheets(GNs) can uniformlydispersed in unsaturated polyester resin matrix. During the ball milling process,unsaturated polyester resin is used to protect the structural integrity of graphene andprevent secondary agglomeration.(3) The tensile strength, Young’s modulus, flexural strength,flexural modulus andhardness are increased as the adding of GNs, and then decreased. The tensile strength,flexural strength and the hardness have the greatest improvement as the content ofGNs is3wt%. Compared with pure unsaturated polyester resin, they are increased by76.6%,67.3%and24.5%, respectively. A47.6%improvement in Young’s modulus isobtained by the addition of0.5wt%GNs. The flexural modulus increase to2769MPaat the loading of graphene is3wt%.What more importantly, the impact properties ofthe composite material does not deteriorate with the addition of graphene.(4) The percolation threshold of the UPR/graphene nanocomposites is7wt%. As theloading of GNs is5wt%, the resistivity decreased as the ball milling time increased atfirst, when ball mill for22h, the resistivity is not changed.(5) The addition of GNs have slightly effect to the thermal stability of the unsaturatedpolyester resin/graphene nanocomposites.(6) With the addition of aluminum nitride(AlN), the thermal conductivity of theunsaturated resin/graphene nanocomposites increased.(7) With the addition of AlN, the electrical conductivity of the unsaturatedresin/graphene nanocomposites increased.