Preparation And Characterization Of Multiple Functional Polyaniline

As one of the most promising conductive polymers, Polyaniline (PANi) has various structures, a high conductivity, a unique doping mechanism, excellent physical properties and a good environmental stability. Its monomer is low-cost and easy to get, and the synthetic way is also facile. Because of these advantages, it has become one of the most promising focuses on the research of conductive polymer materials nowadays. PANi has received great attention due to its properties as low-dimension materials and organic conductors. Compounded with magnetic components can gain functional composites and widen the use of PANi. The composites of PANi and magnetic materials can be conductive and magnet. The conductivity and magnetism can be changed through the control of the content of PANi and magnetic materials in composites. In this dissertation, we described detailedly the synthesis of Fe3O4 magnetic nanoparticles, and the approach of transferring hydrophobic nanocrystals into hydrophilic, the preparation of the self-suspended PANi, and the composites of the Fe3O4/PANi, and the structure and properties of the demonstrated materials.Fe3O4 nanoparticles were synthesized by a high temperature thermal decomposition method. Firstly we synthesized the iron-oleate complex, then the complex was decomposited in the organic solvents with high boiling point. Fe3O4 nanoparticles were modificated by the degraded gelatin solutions and were transferred from hydrophobic nanocrystals into hydrophilic. The morphology was characterized by TEM. And we utilized XRD to analyze the crystallion of the Fe3O4 nanoparticles.TG were used to analysiz the theamal stability and the organic content.The chemical structures were characterized by FT-IR and the saturation magnetization were indicated by VSM.We applied long-chain nonylphenol ethoxylates (10) sulfuric acid (NPES) as dopants to make polyaniline effectively doped and got a novel slef-suspended polyaniline. Rheological analysis shows the modulus and viscosity vs temperature trace of self-suspended PANi. FT-IR and UV-vis were used to comfirm the chemical structures of eigenstate PANi and self-suspended PANi. XRD demonstrated the crystallion of the self-suspended PANi. TEM specctra revealed the morphology of the self-suspended PANi.TG spectra displayed the thermal stability of the self-suspended PANi.Fe3O4/PANi composites were synthesized by an in situ polymeration. TEM spectra were used to confirm the Fe3O4 nanoparticles have been embedded in the polyaniline matrix. The chemical structures were characterized by FT-IR and UV-vis.TG exhibit the organic content and thermal stability. Rheological analysis shows the modulus and viscosity vs temperature trace of Fe3O4/PANi composites. The electrical properties were tested by the conductivity of the Fe3O4/PANi composites.