The Study On Ag Plating Graphene/Epoxy-acrylate Electrical Conductive Adhesive

As the development of science and technology nowadays, energy-saving and environment-protecting have became a common target of the whole world. In the area of electrical packing, the using of novel electrical conductive adhesive, which is low in energy consumption, environment-friendly, instead of traditional tin/lead solder, would be an irresistible trend in the future. In this paper, Ag-planting-graphene was used as conductive filler and epoxy-acrylate adhesive was used as matrix material to produce two novel electrical conductive adhesives with good mechanical and conductive properties as well as good thermal stability.The conductive filler of the Electrical Conductive Adhesive (ECA) in this paper was prepared from natural flake graphite, Graphite Oxide (GO) was obtained by Hummers method, and the GO was disposed with ultrasonic to get graphene oxide. After AgNO3was mixed with the graphene oxide, ethylene glycol and NaBH4were used to reduce the mixture corporately. Then the nano-conductive filler of Ag-planting-Graphene (Ag-G) was obtained. Epoxy-Acrylate (EA) was synthesized by epoxy resin with acrylate acid to be used as matrix material, then Methyl methacrylate as diluent, Benzoyl peroxide as curing agent, N,N-dimethylaniline as curing catalyst and other assistant agents were added to get two-component epoxy-acrylate adhesive (EA1adhesive); In addition, methyl methacrylate as diluent, benzophenone as curing agent and other assistant agents were added to get UV curing epoxy-acrylate adhesive (EA2adhesive). The Ag-G was mixed with the EA1adhesive to produce Ag-G/two-component Epoxy-Acry late Electrical Conductive Adhesive (Ag-G/EA1ECA) and with the EA2adhesive to produce the Ag-G/UV curing Epoxy-Acrylate Electrical Conductive Adhesive (Ag-G/EA2ECA), respectively.The characterization of Ag-G has been carried out by Transmission Electron Microscope (TEM), X-ray diffraction (XRD), Raman spectrum (Raman) and X-ray photoelectron spectroscopy (XPS). It could indicate that the conductive filler Ag-G has been produced successfully. The acid value detection and FT-IR analysis indicated that the optimal reaction time of the synthesis of epoxy-acrylate was3h.The shear strength (T) of the two kinds of ECA was tested by the universal testing device to get the relationship between the shear strength of ECAs and the content of conductive filler. It could be observed that the shear strength was decreased with the increasing of content of conductive filler. Moreover, the standard digital multimeter was used to estimate the resistance (R) of the two kinds of ECA. Through formula computing, the relationship between the electrical conductivity (к) of ECA and the content of conductive filler were obtained. As the increasing of content of conductive filler, the electrical conductivity increased rapidly, but it changed a little when content of Ag-G reached to25wt%in the two kinds of ECA. The thermal stability was carried out through thermogravimetric analysis (TGA). From the curves of TG and DTG, the thermal property parameters were as follows:the initial temperature of thermal degradation (to), the maximum weight loss rate (Dm) as well as the temperature of maximum weight loss rate (tm), and the final carbon residue quantity (w) were obtained.Comprehensive analysis of the whole experiment results demonstrated that both the shear strength and electrical conductivity of Ag-G/EA1ECA were better that of Ag-G/EA2ECA. Meanwhile, both of the two ECA showed good thermal stability.