Order Preparation And Performance Of Submicron Structural Conductive Polymer Materials Research

The ordered sub-micron structure PS/PAN conductive composite materials have wide application in electronics, information and other high-tech areas, due to their own structure of order and high conductivity.In this paper, the self-assembly conditions of sub-micron polystyrene spheres (PS) was detailedly studied and the optimal condition was found. In order to immobilize the submicron PS spheres, polyaniline (PAN) was fabricated on the surface through electrochemical deposition and the optimal synthesis condition was also researched. Compared with pure PAN, the ordered sub-micron PS/PAN composites shows better conductive and REDOX performance. Rare earth element samarium was introduced into the composites and its influence on the composites properties was also investigated.1. Polystyrene spheres with the particle diameter ranged from100nm to1000nm were synthesized via the emulsifier-free emulsion polymerization and dispersion polymerization. The morphology of PS was observed by transmission electron microscopy (TEM). And the results show that the particle diameter of PS could be adjusted by the monomer concentration, initiator content, reaction temperature and stirring speed.2. PS microspheres were self-assemblied on the conductive glass surface by the vertical deposition method and the physical confinement method, respectively. The morphology of PS microspheres was observed on the field emission scanning electron microscope (FE-SEM). The impact of experiment conditions, such as temperature, particle size and concentration of microspheres, on the degree of order was studied. The results show that the optimal condition in the vertical deposition process is temperature of40-50℃, particle size range of100-300nm, the concentration of0.2%. In these conditions, PS microspheres were packed close and orderly with a hexagonal close packing structure.3. A three electrodes system was adopted to fabricate polyaniline on the PS surface and the ordered sub-micron PS/PAN composite with conductivity was obtained. The infrared spectrometer. field emission scanning electron microscope, electrochemical impedance spectroscopy, cyclic voltammetry were used to investigate the synthesis conditions of PS/PAN materials with high conductivity. The results show that the ordered sub-micron PS/PAN composite prepared for6minutes via constant voltage electrochemical polymerization exhibits the best conductive performance, when the concentration of aniline is0.2mol/L-0.5mol/L, HC1concentration is1.0mol/L, PS size is about100nm and microsphere concentration is0.2%.4. Rare earth element samarium was introduced into PS/PANI composite materials. The composites were characterized by field emission scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy (EIS), cyclic voltammetry. The results show that the crystallinity of PS/PANI composite was improved and its microstructure was also influenced due to the introduction of rare earth element samarium. Moreover, the addition of samarium preferred the formation of more smaller nano-particles. The EIS results show that the addition of samarium can modulate the PS/PANI composite conductivity to some extent. When Sm3+concentration was below0.6mol/L, the conductive properties of the composites decreased with the increase of Sm content. While the conductivity increased at [Sm3+]=1.0mol/L.