Study On Preparation, Formability And Performance Of PPy/intrinsic Conducting Polymers Conductive Composite

The conductive polymes are generally defined as follows: the polymers whichare polymerized by chemical or electrochemical method, the main chain are πconjugated pairs, the conductivity is between semiconductors and conductors by doping.They usually refers to the intrinsic conductive polymers.The intrinsic conductingpolymers have many advantages such as low-density, structural diversity andmolecular design. They have broad application prospects in the industrial, militaryand civilian production, are received widespread attention and research at home andabroad by the past two decades. The typical representations are polyacetylene,polythiophene(TP) and polypyrrole(PY). Although the conductivity of TP&PY islower than polyacetylene, but they have good electrical properties and thermalstability, can be used for the preparation of electronic devices. Howerver, the poorprocessing performance of TP&PY limit their practical application. They usuallycompound with inorganic matter to prepared the intrinsic conductive polymer/inorganic composite materials with high conductivity and good processing properties.The research at home and abroad is mainly concentrated in the carbon nanotubes,graphene sheets, and other inorganic nanomaterials with intrinsic conducting polymercomposite, but very rare on grapheme with the intrinsic conducting polymer. Thegraphene is the only two-dimensional free atomic crystal by now. It has manyoutstanding advantages such as high conductivity, high surface area and excellentmechanical properties, low cost and simple chemical treatment method. Therefore, themain work of this paper is the following points:1. The TP(PY)/graphene conductive composite have been prepared by using theTP/PY as the matrix doped with the grapheme. And then its characterization wereinvestigated in detail by means of such techniques as the analysis of transmissionelectron microscopy (TEM), scanning electron microscope (SEM), flourier transforminfrared spectroscopy(FTIR), thermo gravimetric(TG) and four probe meter andvibration magnetometer. The result showed that graphene are uniformly dispersed inthe polypyrrole(polythiophene) matrix, the conductive properties and the machiningperformance of the composite had increased. 2. The curve of conductivity and thermal stability of composites with thecontent of the raphene have been studied. The study showed that the conductivity ofthe composites with the content of graphene existed the growth inflection point.Thismay be due to the graphene formed a Local conductive network in the composites,electrons can be transmitted through the tunnel effect to increase the electricalconductivity.So, the economy and conductivity could balance by optimizing thecontent of graphene.3. The graphene-PPy/epoxy-pmma Consistent conductive film is successfullysynthesized hrough the methods of grind, comeback Pulling film. Its characterizationwere investigated in detail by means of such techniques as the analysis oftransmission infrared spectroscopy(FTIR),thermo gravimetric(TG),electronmicroscopy (TEM),electron microscope (SEM), scanning, fourier transform and fourprobe meter and vibration magnetometer. As the results showed that the investmentepoxy into pmma not only improves the thermal stability but also keep the excellentelectrical conductivity.