Studies On Modification Of The Two Kinds Of Carbon Materials

In recent years, the field of materials is developing at fast speed and the new carbon materials attract many researchers attention. In this work, the preparation and properties of expandable graphite and graphene oxide were investigated.The expandable graphite was prepared by chemical oxidation method using nature flake graphite, KMnO4as the oxidant, HNO3and oher acids as the intercalation agent. Through large number of experiments, the optimum process conditions were determined; Graphite oxides were prepared by Hummers method. The optimal reaction conditions were determined. And the optimal ultrasound time of the preparation of graphene oxide was determined through experiments.The structure, morphology, internal composition and thermal decomposition properties of expandable graphite and graphene oxide were analyzed and characterized by SEM、FTIR、 XRD、TG-DSC. The results showed that, during the preparation of expandable graphite, the intercalates like NO3-、C1O4-、COOH-had already been inserted into the graphite layers; During the preparation of graphite oxide, the graphite has been fully oxidized. And the prepared graphene oxide had many functional groups.The thermal stability of expanded graphite and graphene oxide were characterized by TGA and DSC. The infrared absorption and the attenuation of millimeter wave were tested by FTIR and millimeter-wave test system. The results showed that, the released heat was much larger than the absorbed heat for the two carbon materials; Expanded graphite worm had certain absorption capacity as to some infrared wavelengths; The dynamic tested of millimeter wave showed that, expanded graphite worm dispersed in the laboratory and explosion had a better interference effect on millimeter wave.