Interfacial Polymerization Of Polyaniline And Its Derivatives And Characterized

This dissertation focuses on the studies on the interfacial synthesis and characterization of conductive Polyaniline (PANI) and poly o-phenylenediamine (POPD), and the study on the supercapacitance of electrode materials based on nano PANI.Interfacial polymerization had been proved an effective method to synthesis vast and uniform nano-fiber PANI. The PANI nanofibers obtaind by this method have a diameter under 100 nm and length more than 500 nm when using hydrochloric acid (HCl), camphor sulfonic acid (CSA) and other dopant acids. Fluorescence spectra show that these PANI with nanofiber structure has good fluorescence, and among which the PANI nanofibers doped by poly(styene sulfonic acid) sodium salt (PSS) have prominent fluorescence. The test of solubility indicates the PANI fibers doped with organic acids all have the good solubility.Two kinds of oxidant, ammonium persulfate (APS) and ferric chloride have been used in interfacial polymerization to prepare one-dimension ultrastructural PoPD. PoPD with sphere structure were obtained when the oxidant is APS and no dopant acid is used. The product PoPD's structure could be belt, rod, and bulk when the oxidant has been changed to ferric chloride and the influencing factors are the reaction time, the concentration of oxidant, oPD and their ratio. The X-ray diffraction spectrum shows that this PoPD has good crystallinity.PoPD doped with HCl, malonic acid or polyelectrolyte has been prepared when the oxidant is APS and the PoPD show differert morphology. When the dopant is HCl, macroscopic PoPD microfibrils are prepared; when the dopant is malonic acid, particle PoPD are obtained and when the dopant is polyelectrolyte, the product is PoPD film.The supercapacitance of electrode materials based on nano PANI synthesized by interfacial polymerization has been investigated. The charge/discharge test shows the studied PANI has a specific capacitance of 297 F/g. After 500 cycles of charge/discharge, the dacay of specific capacitance is under 5%. The results of cyclic voltammetry and ac impedance tests show that this PANI electrode material has good stability and performance of supercapacitance, which is suitable for the application in electrochemical supercapacitors.