Fabrication And The Electrochemical Properties Of Conducting Polymer PEDOT/MPS-PPV

Conductive polymer has attracted a great deal of attention due to its unique optical, electrical, magnetic, thermal and other properties, showing a very wide range of applications. With good electrochemical activity, environmental stability and workability, poly-3,4-ethylenedioxythiophene(PEDOT) is one of the most widely used and in-depth studied conductive polymer. And it is also one of the most promising conductive polymer in the field of electronics, optics, biology, etc.However, it is insoluble in any solvent, and can not be melted because of its special conjugated long chain structure, which makes it very difficult for PEDOT to process,thus limiting its use. So improving the processing performance of PEDOT become very important and meaningful. To improve the workability, dispersion of PEDOT doped with soluble conjugated polyelectrolyte has been made. The electrical and electrochemical properties of the dispersion is investigated in this paper.The dopant slected in this paper is poly[[2-methoxy-5-(3-sulfonatopropoxy)-1,4-phenylene]-1, 2-ethenediyl](MPS-PPV),which is a derivative of of poly(p-phenylenevinylene)(PPV), which is also a conductive polymer. First, MPS-PPV is synthesized by styrene sulfonate through Gilch method, which is a mild route. The intermediate products is characterized by nuclear magnetic resonance and infrared spectra. And the final products is analyzed by infrared, ultraviolet and fluorescence spectra, to verify the production of the final target product--MPS-PPV. Then, PEDOT / MPS-PPV dispersion is synthesized by in situ chemical oxidation polymerization, and explore the influence of the molar ratio of EDOT and monomer dopant, reaction time and polar solvents on PEDOT conductive properties. The ectrochemical performance of PEDOT bulk powder and PEDOT/MPS-PPV was investigated by using cyclicvoltammetry(CV) and charge/discharge experiment. The results showed that the polymer has relatively has a higher and permenent specific capacitance when the EDOT monomer and dopant molar ratio of 2:1, the reaction time was 24 h, and adding a polar solvent EG.