Reseach On Functionaliztion Of Graphene Oxide And Poly (Aryl Ether Nitrile) Composites

Graphene is a kind of two-dimensional carbon material. It consists of a single atomic layer of sp2 hybridized carbon atoms arranged in a hongeycomb structure. These include high quality of the electronic, crystaline and a high specific surface area. In contrast, Graphene oxide(GO) have various oxygen-containing functional groups in its each layer, as a new carbon materials. The oxygen function groups have been identified as mostly in the form of hydroxyl and epoxy groups, with smaller amounts of carboxy,carbonyl and phenol. The polar oxygen functional groups of GO render it strongly hydrophilic, lead to GO good dispersibility in many solvents. Researchers hope to use GO as a substrate material, fabricating hybrid materials with different functions by modifying the surface of the GO. Then, the dispersity of GO-based hybrid materials in the polymer can be improved by taking advantage of hydrophilia of the polar bond on the surface of modified GO.Poly(arene ether nitriles)(PEN) is a novel engineering resin, with excellent performance in flame retardancy, high temperature resistance, mechanical strength and chemical adhesion. So it is expected to play important role in military industry,aerospace industry, automobile industry, electronic industry, telecommunication industry and other special area. In order to enhance the dielectric and microwave absorbing performance of material without the loss of thermal and mechanical performance, researchers utilized cheap Bisphenol-A-type PEN as matrix to prepare GO@CuPc and GO@Fe3O4/FePc hybrid materials, and different modification on graphene oxide can realize the desirable hybrid materials dispersal in PEN. Finally, the prepared hybrid material are added to PEN in different proportion via solution-casting to obtain PEN/GO@CuPc and PEN/GO@Fe3O4/FePc composites. The contents of this thesis are as follows :(1)Graphene oxide was prepared by means of the modified Hummers method.Then GO@CuPc was prepared via solvent-thermal route, Cupric Acetate dehydrate was adopted as copper source, glycol as organic phase. SEM and TEM results show that rod-like CuPc disperses on the surface of graphene oxide evenly, UV-vis and FTIR results indicate the existence of CuPc and graphene oxide on the hybrid material.(2) We hope to prepare an excellent microwave absorbing hybrid material,with graphene monoxide as carrier, FeCl3·6H2O as iron source, glycol as organic phase.Experiment results reveal that increasing the amount of BPH will result in the increasing microwave absorbing performance of GO@Fe3O4/FePc hybrid materials.Especially, reflection loss of hybrid material reaches-27.92 dB when the amount of BPH is 0.1g.(3)Then, the two hybrid materials with different modification were added into Bisphenol-A-type PEN in different proportions, aiming at prepare composite material with excellent property via solution-casting. PEN/GO@CuPc and PEN/GO@Fe3O4/FePc were successfully prepared. The dielectric constant depends slightly on the change of frequency when the GO@CuPc hybrid loading is below 3.0wt.%; there is then a turning point at 3.0 wt.%, followed by an abrupt increase. So the percolation threshold of the composite films was approximately 3.0 wt.%. As the GO@CuPc loading reached 5.0 wt.%, the dielectric constant reached 52 at 100 Hz.Meanwhlie, the microwave absorbing properties of composites were enhanced with the increasing addition of GO@Fe3O4/FePc...