Study On Preparation And Properties Of Polyaniline Nanocomposites

Polyaniline (PANI) is considered as one of the promising conducting polymers owing to relative high conductivity,favorable possibility and relative stability. Fibular PANI has more excellent properties than that of granular PANI, It play an important role in the manufacture of nanoscale functional and interconnected units of electronics, optoelectronics, electrochemical and electromechanical devices.The conducting PANI /inorganic nanoparticle composites have combined the char acteristics of conducting polymers and inorganic nanoparticles. The applications can be further expanded in the field of photoelectric conversion materials, petrochemical s, electrochemical catalysis, batteries, national defense and so on. Conducting PANI /inorganic nanoparticle composites have attracted considerable attention because of their novel physical and chemical properties and potential applications. So far there is less study dealing with PANI/inorganic nanoparticle fibular nanocomposites.Doped polynailine were synthesized using oxidation with various acids at first, PANI/Co-TiO₂ composites,PANI/CeO₂ composites and PANI/Ag-TiO₂ composites were synthesized via "In situ" polymerization. The possible forming mechanisms of polyaniline fibers were investigated and properties of nanocomposites were studied. The main research results as following:(1) Polyaniline were synthesized in water by chemical oxidation and doped threekinds of different inorganic/organic acids. The affects such as the type of acid and dopant, oxidant concentration on conductivity capabilities and structure of PANI were studied. Conductivity and thermal stability were investigated by FT-IR and TGA.(2) Under the conditions of the ultrasonic, "In situ" polymerization was carried out in the presence of TiO₂ and Co-implanted TiO₂ as precursor to synthesize PANI/TiO₂ and PANI/ Co-TiO₂ composite in an aqueous medium. The nanocomposites were characterized by FT-IR,SEM and TEM,and their conductivity was studied on the different amounts of Co doped.(3) The PANI/CeO₂ fibular nanocomposits were synthesized via chemical oxidation of aniline using nano-CeO₂ as an oxidant, and nano-CeO₂ was prepared by hydrothermal treatment. The resulting composites were characterized by XRD,SEM,FT-IR. The influences of the concentration of acid and CeO₂ particle size on the possible forming mechanisms of polyaniline fibers were studied. (4) The nanocomposite materials of TiO₂ doped with different Ag content were prepared by hydrothermal treatment, and PANI/Ag-TiO₂ fibular composites were synthesized via "In situ" polymerization. The effects of light source, components of composites and type of bacteria on antibacterial property of Ag/TiO₂ powder and PANI/Ag-TiO₂ fibular nanocomposite were investigated.