Preparation, Characterization And Properties Of Conductive Polypyrrole/Nano-composite Materials

Conducting polymer nanocomposites (CPC) have motivated considerable interest in recent years because of their unique properties and potential applications.In this dissertation, a powdery conductive macromolecular material-polypyrrole was synthesized with chemical oxidative method, the conductivity of synthesized PPy was effect with the dosage of oxidant, the type of oxidant, reaction temperature and polymerization time. The results indicate that, the conductivity of PPy goes with an increase in the dosage of oxidant by a first major trend and then decreased, and is higher when FeCl₃ is as the oxidant. It also increases with the reaction time, and becomes better in low temperature.The synthesis process was optimized by the orthogonal designation. We can get the best conditions of synthesizing PPy that as follows: the oxidant is FeCl₃, make sure the amount of PPy and FeCl₃ with the molar ratio at 1:1, the reaction temperature is 0℃and the reaction time is 6 hours. The conductivity of PPy can reach to 0.0842 S/cm under this condition. The structure, morphologies, thermal stability test and electrochemical tests were also researched. PPy synthesized under this condition has better thermal stability and electrochemical activity than others. Auniform dope was prepared by the mechanical blending method. PPy was seen as functional component and epoxy resin was film-forming materials. It was also researched that the corrodent electrochemistry behavior of Fe covered by epoxy resin and PPy. So it provided some basic information for the further study of PPy.A series ultrafine perovskite-type nano powdery materials La1-xCaxMn_0.7Co_0.3O₃(x=1.0, 0.9, 0.8, 0.7, 0.6) were prepared by the method of glacine-nitrate process, a new combustion synthesis method. Then the materials were heated at different temperature. And their chemical structure, bonds, size, composition and morphologies were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometer (XRD), scanning electron microscope (SEM) and electron spectroscopy (EDS) in order to screen out complex oxide with better structure and property.La_0.3Ca_0.7Mn_0.7Co_0.3O₃/PPy inorganic-organic nanocomposite materials with different contents of PPy were prepared by an as-polymerization method. The structure, morphologies and electrochemical properties of the samples were characterized by means of FTIR, XRD, SEM and electrochemical tests used three electrode. The results indicate that composite material exists in the interaction between polypyrrole and complex oxide, PPy reduces the reunion of the nano-particles. The composite redox peak current becomes larger with increasing of pyrrole contents. Redox property and reversibility of the composite get improvement. These phenomena just embody the electrochemical activity of the composite. The influence of H₂O₂ catalytic performance by composite material modified glassy carbon was also researched.DBSA/PPy organic-organic nanocomposite materials was prepared by reverse microemulsion polymerization. The structure, morphologies and electrochemical properties of the samples were characterized by means of FTIR, XRD, SEM and electrochemical tests used three electrode. Results show that Composite materials existed in the cooperated interaction between DBSA and PPy. Cyclic voltammetry shows that, in KOH solution, composite materials had a better electrochemical activity.