Preparation And Properties Of Polypyrrole And Graphite Oxide Nano-composite

In Conductive polymer/layered inorganic nano-composites, the compound of conductive polymers and layered inorganic film layer of nano-composite materials gives the composite material with excellent mechanical, thermal, electrical and electrochemical properties. Therefore, the conductive polymer/layered inorganic nanocomposites have become one of the main research directions of new functional materials. Polypyrrole(PPy) has been extensively studied due to its adjustable conductivity、nice environment stability and relatively easy preparation,In this article, polypyrrole has been synthesized by the way of chemical oxidation. Then, we have investigated the impact of different systems (acidic, aqueous solution) and the oxidant concentration to structure and performance of polypyrrole, which established the preparation of high conductive properties of polypyrrole process and process conditions. Oxidation of the graphite was prepared by amended Hummers method, and PPy/GO nano-compound material was prepared by situ polymerization. PPy/GO nano-compound material structure and performance was examined systematically by the influence from molar ratio of surfactants and pyrrole, molar ratio of ammonium persulfate and pyrrole, and mass ratio of graphite oxide and pyrrole and other processes. Then, we discussed the PPy/GO nano-compound material in the application of absorbing properties.The materials were analyzed and studied referring to SEM, FTIR, XRD, four-point probe measurement method, infrared emissivity, electromagnetic parameters, and reflection loss. The results show that:(1) in composite material, polypyrrole embeds into the oxidation graphite layers, making the space between oxidation graphite layers larger, and structure of polypyrrole has also changed.(2) Infrared emissivity of composite material is about0.17higher than that of polypyrrole.(3) Electromagnetic loss of the composite materials has greatly improved, and the reflection loss is up to-34dB, while the polypyrrole reflection loss is only-3dB. And effective bandwidth is more than6GHz between0-20GHz frequencies which is less than-8dB. Compared to polypyrrole, the dielectric loss of the composite materials has greatly improved, and its absorbing property is as large as ten times of polypyrrole.