Preparation And Properties Of Phthalonirile/Graphene-based Aerogel

Graphene,as a new type of two-dimensional carbon nanofiller,has received extensive attention in recent years.Graphene is currently regarded as"the thinnest layer in the universe”and widely used in energy,biology and information fields due to its excellent mechanical properties,high thermal conductivity and outstanding electron transport properties.As a nano-reinforcing filler for polymers,graphene can dramatically optimize the mechanical,thermal and electrical properties of polymers under very low dosage conditions.However,graphene is prone to agglomeration and poor dispersibility in the polymer,hindering its further application.By constructing the three-dimensional structure of graphene to increase the spatial distance between the layers,the purpose of improving the dispersibility can be achieved The graphene aerogel retains various excellent properties of graphene while forming a stable three-dimensional structure.Phthalonitrile resin with high heat resistance,excellent electrical properties and moisture resistance.Here,this paper combines the graphene and resin to constructs a three-dimensional composite aerogel structure by self-assembly chemical reduction method,and then studies its structure and properties.The specific content of this study is as follows:(1)Graphene oxide was prepared by the modified Hummers method.The infrared spectroscopy,Raman spectroscopy,X-ray diffraction,transmission electron microscopy and atomic force probe microscopy,X-ray electron spectroscopy was used to characterized the structure of the synthesized graphene oxide.(2)By designing the molecular structure of phthalonitrile,a m-aminophenol type phthalonitrile resin monomer was prepared by a simple one-pot method,and the reaction was a nucleophilic substitution.Since the resin itself has an amino group,rapid self-curing can be achieved without the addition of a curing agent.The structure of the monomer was characterized by infrared spectroscopy,mass spectrometry and nuclear magnetic resonance spectroscopy.The thermal behavior of the resin was analyzed by differential scanning calorimetry to obtain a melting of the resin from 130?,the melting peak at 170? reached the highest,and the peak of the solidification exotherm was 225?.Subsequently,a cured product of the resin was prepared,and its heat resistance was examined by a thermogravimetric test to obtain a carbon residue ratio of 74%at 800?.(3)The solvent prepared by graphene aerogel was explored,and N,N-dimethylacetamide was selected as solvent.Solvent thermal self-assembly method was used to prepare phthalonitrile/graphene-based aerogel at different ratios.The structure of aerogel was characterized by infrared spectroscopy,X-ray electron spectroscopy,Raman spectroscopy,X-ray diffraction and scanning electron microscopy.It was proved that graphene and resin were successfully co-assembled.The effect of different proportions of resin on the performance of graphene aerogel was analyzed by measuring the specific surface area,contact angle,thermal conductivity and electrical conductivity of the aerogel.