Reverse Micelles As A Template Synthesis Of Polyaniline Ultra-fine Powder

Polyaniline(PAN) is considered one of the most promising conducting polymers because of its excellent environmental, thermal stability and unique doping mechanism. However, the difficulty of the PAN for solubility and melt interferes its commercial applications. Many studies have been made in order to promote the solubility and processability of the PAN, among which the template-synthesis of PAN becomes one of the focuses for polymerization of aniline. We chosen the reversed micelle system as template to synthesize polyaniline and discussed its characters.Polymerization of aniline was performed in three different reversed micelle systems as template, namely, AOT (bis(2-ethylhexyl)sodium slfosuccinate)/iso-octane, OP (p-octyl polydthylene glycel phenylether) /caprylie alcohol/cyclohexane and CTAB (hexaclecylerimethyl ammonium bromide)/chloroform/caprylie alcohol. Polymerization conditions including molar radio of aniline and the oxidant, reaction time, drop speed of the oxidant, reaction temperature, concentration of the acid and the surfactants on the apparent yield and conductivity were discussed. The optimal conditions for synthesis were discussed and the differences among the chosen systems were analyzed.PAN was prepared by oxidation with ammonium peroxydisulfate (APS) separately in CTAB/hexanol reversed micelle and SDBS(sodium dodecyl benzene sulfonic acid) micelle systems. UV-Vis and IR spectra, crystalline structure and thermal stability were investigated. The differences of the synthesis of PAN between reversed micelle and micelle systems were discussed, including the initiate speed, the stability of the dispersion, the UV-Vis and IR spectra, the conductivity and so on.The morphology of the products was premilinarily studied. The influence of different factors on the size and morphology of the obtained products was discussed, including the size of the "water pool" of the reversed micelle, theAbstractconcentration of the aniline, the kind of the surfactant and the ultra-sonic dispersion. On these basis, we assumpted the formation of the PAN ultrafme particles in reversed micelle system.