Preparation And Properties Of Polyaniline Nanocomposite

Polyaniline(PANI) nanomaterials have been synthesized by direct mixed reactionmethod in tartaric acid system. The morphology and structures of polyaniline havebeen characterized and analyzed by scanning electron microscope (SEM), InfraredSpectroscopy (IR) and Ultraviolet-visible spectroscopy (Uv-vis) spectrometers. Theyield and conductivity rates of polyaniline have been measured. The effects of differentoxidizing agents, acid concentration and reaction time on polyaniline nanomaterialstructure, morphology and properties have been showed. The dedopant conditions ofpolyaniline doped with H2SO4by using ammonia and polyaniline have been redopedin tartaric acid system to improve the performance of anticorrosion. PANI/epoxycomposite coatings have been prepared based on tartaric acid doped PANInanomaterials, and the anticorrosion performance of the coatings on the mild steel istested by electrochemical measurement technology. With using solution mixing andin-situ compositing methods, PANI/Bi2WO6composite powders have been prepared bycompounding polyaniline with Bi2WO6. The morphology, crystalline andphotocatalytic properties of PANI/Bi2WO6composite powder have been discussed andanalyzed under different experimental conditions.The main results are summarized as follows:1. The morphology, structure and conductivity of polyaniline have beenanalysised and charactered by using the FTIR, SEM and so on. The experimentalresults showed that when the concentration of0.1mol/L tartaric acid,24h reaction timeand [ANI]/[APS] being equal to0.8, the morphology of polyaniline nanofibers dopedwith tartaric acid is best. The nanofibers diameter is about100nm and length up toseveral micrometers and the nanofibers forming clusters, and the yield rate is121%,and the conductivity is2.13×10-2S/cm.2. In the sulfuric acid system, the doping polyaniline nanofibers with the regular structure and morphology are prepared. Without changing the physical appearance ofthe product condition, the conductive polyaniline material with dedoping polyaniline isobtained in the ammonia solution. Basis on the dedoping polyaniline, polyaniline isredoped with tartaric acid, which can keep the good morphology of polyanilinenanofibers, and the functionality of the acid functional groups can be doped in thestructure of polyaniline. The redoped polyaniline coating has a better anticorrosionperformance than doped polyaniline coating. The anticorrosion ability of twopolyaniline coatings to mild steel is decreased with the extension of immersion time.The open circuit potential (OCP) of redoped polyaniline coating is improved125mVand the impedance value of redoped polyaniline coating is a order of magnitude higherthan doped polyaniline coating after immersing for30days, and it is due to the regularmorphology of polyaniline improved its anticorrosion property.3. When using the method of solution blending prepared PANI/Bi2WO6compositepowders and the amount of polyaniline reaching1.5%, the highest rate of degradationof methylene blue reachs52.5%and the photocatalytic works best. When using in-situcompound prepared PANI/Bi2WO6composite powders and the amount of polyanilinereaching1%, the degradation rate reachs75.5%and the photocatalytic effect is best. Itshows that the photocatalytic activity of the composite powders prepared by in-situcomposite method is better than the activity of the powder by solution mixing. Thephotocatalytic properties of PANI/Bi2WO6powders by compounding polyaniline ininorganic acid systems with Bi2WO6is better than PANI/Bi2WO6composite powder bycompounding polyaniline in organic acid systems with Bi2WO6. The Uv-vis absorptionspectrum of PANI/Bi2WO6composite powders is prepared in sulfuric acid system andits redshift degree of PANI/Bi2WO6is maximum, and the photocatalytic activity isbest.