Study On The Preparation And Properties Of Composited Polyaniline

Among the many conjugated conductive polymer (eg. polypyrrole, polythiophene), owing to polyaniline has such a great of advantage:a) material easy to get; b) simple preparation methods; c) excellent stability; d) low cost; e) unique doping mechanism; f) good electrical conductivity properties after doping, it becomes one of the hot materials science, and is considered the most promising for the actual functional polymer materials, through 20 years of research, polyaniline show an attractive prospect in many of areas (eg. metal corrosion, sensors, etc.). Thus conductive polyaniline is given more and more attention in recent years. In this article, we prepared three types conductive polyaniline composite materials, and their performance has more in-depth research. According to the literature reference and experimental conditions, in this paper, the main contents and conclusions were included the following aspects:(1) In situ polymerization of An in the exfoliated a-zirconium phosphate. During the process, ethylamine, butylamine and tetrabutyl oxyammonia (TBA+OH-) were used to exfoliate a-ZrP. and ammonium persulfate (APS) was oxidant, the composites of a-zirconium phosphate/polyaniline (a-ZrP/PANi) were synthesized in acidic aqueous solution. The structures and properties were studied by fourier transform infrared (FT-IR) spectra, X-ray diffraction (XRD), the standard four probe technique, and scanning electron microscopy (SEM). All of the results showed that strong interactions existed between exfoliated a-ZrP and PANi molecule, and comparing with non-exfoliationα-ZrP/PANi, their conductivity increased. With the different exfoliated agents loading, obvious variations on structures and conductivity of the composites were observed. Larger layer distance of exfoliated a-ZrP would result in improved conductivity of composites.(2) A novel conductivity composite from polyaniline (PANi) and layered zirconium phenylphosphonate (ZrPP) was carried out by in situ chemical oxidation polymerization method by adding appropriate amount of ammonium peroxodisulphate (APS) solution, and the relevant structure and properties were investigated. The composites were characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The electrical conductivity was measured by Four Probe technique. It was found that the electrical conductivity of the nanocomposites enhanced with the increase of zirconium phenylphosphonate loading and the materials had a reasonably good electrical property even with 40 wt% loading of layered material to the polymer matrix. When the ZrPP content was 40wt%, the conductivity of the composites showed a maximum:1.625 S/cm. The results revealed that interaction had been formed in the nanocomposites, which enhanced the electrical conductivity of the nanocomposites compared with neat PANi. The presence of zirconium phenylphosphonate (ZrPP) in the matrix had greater influence on the observed conductivity values than that of the same system without zirconium phenylphosphonate.(3) Copolymer poly (aniline-co-o-toluidine) were synthesized by chemical oxidation polymerization method by adding appropriate amount of ammonium peroxodisulphate (APS) solution in the presence of cetyltrimethylammonium bromide (CTAB) and in the conditions of ice bath environment. In order to prepare poly (An-o-OT) with good solubility, relatively high conductivity, we remained other conditions and changed the molar ratio of An and o-toluidine, the structure and properties of copolymer by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and solubility. The electrical conductivity was measured by Four Probe technique. We found the optimal monomer ratio of 1:1 and measured a maximum conductivity of 2.31 S/cm.