Effects Of Magnetic Field On The Phase Behaviors Of Microemulsion System Of Composite Emulsifier/Aniline Polymerization And The Electrochemical Properties Of The Product

Polyaniline has been one of the most promising commercial conductive polymers, because of its advantages of unique doping-dedoping mechanism, excellent environmental stability and good electrochemical properties. Currently, it has been widely used in basic materials, such as pH-sensors, rechargeable batteries, membranes and corrosion-protecting coating.Magmetic field (MF) affect has a marked impact on free radical polymerization and induces the polumer orientation of most organic molecules and biological macromolecules. Because of the anti-magnetic of PANI, the molecules of PANI has anisotropic diamagnetic susceptibility, therefore, the introduction of MF into the synthesis process of PANI can obviously improve doping degree, conductivity, molecular weight and solubility of the PANI. Besides, two or more surface active agent mixture, can play a synergistic to each other to make up for the role of defects in their performance, and that is the synergistic effect of surfactants.Therefore, this paper prepared the microemulsion system of sodium dodecyl benzenesulfonate preparation (SDBS)/Triton X-100(TX-100)/n-butanol(nBA)/ aniline(An)/hydrochloric acid solution (HCl). The effects of the magnetic field(MF)(0.4T), the mass ratio of n-butanol(nBA) to composite emulsifier (Km=mnBA/mSDBS/TX-100) and sodium dodecylbenzenesulfonate(SDBS) to Triton X-100(TX-100)(Sm=mSDBS/mTX-100) on the phase behavior and conductivity of the microemulsion system during composite emulsifier/aniline polymerization were investigated by the pseudo-ternary phase diagram of SDBS/TX-100/nBA/An/HCl. The effects of preparation conditions such as the MF, the effects of the mass ratio of sodium dodecylbenzenesulfonate (SDBS) to Triton X-100(TX-100) and the amout of composite emulsifier(E) and oxidant(APS) and the polymerization time on the electrochemical properties of PANI were discussed by cyclic voltammogram and Tafel using the carbon paper loaded PANI as working electrode. The characterization results of the electrochemical properties of the products were proved by the analysis of the UV (UV), X-ray diffraction (XRD) and conductivity.The results showed that with the increase of Km, the area of microemulsion region increased initially and then decreased, the area reached the maximum on condition that Km is equal to 1.0; with the decrease of the Sm, the area increased gradually; the area was increased by the MF, and with the decrease of the Sm, the effect of MF on the microemulsion system was weakened. The characterization result of cyclic voltammogram(CV) showed that the CV property of the polyaniline prepared by microemulsion polymerization in the presence of composite emulsifier was better than that prepared in the presence of single emulsifier (SDBS or TX-100). Conductivityand XRD analysis result indicated that the PANI synthesized in the presence of MF there is significant on the crystalline degree and the conductivity properties. UV results indicated that the interaction force between molecules reduced, the delocalization of molecular chain increased, and the main characteristic absorption peaks of the PANI prepared in the presence of MF had the trend of moving to low-frequency due to the orientation of MF.