Synthesis,Characterization And Properties Of Poly(aniline-co-fluoroaniline)

In recent years, polyaniline （PANI） has become a kind of conductive polymer withhottest study, because of its advantages of good electrochemical properties and excellentenvironmental stability. However, since the structural characteristics of polyaniline,made itself insoluble, infusibility, refractory the difficulties of forming, limiting itspotential application. The solubility and manufacturability of polyaniline can get greatimprovement by introducing fluorine into the benzene ring.In the present work, the copolymerization of aniline （An） and2-fluoroaniline （FAn）was carried out in order to enhance the solubility of copolymer based on effectivelymaintain its conductivity. It provides a new way to prepare high solubility, highconductivity PANI for reference. This paper has discussed the following aspects:①The soluble conductive poly（aniline-co-fluoroaniline）[Poly（An-FAn）] wassynthesized by emulsion polymerization which using potassium bichromate （K₂Cr₂O₇）as initiator, sodium dodecyl benzene sulfonate （SDBS） as emulsifier and doping agent.②The properties of copolymer were analyzed and characterized by cyclicvoltammogram （CV）, solubility experiment and four-points-probe technique, etc. At thesame time, the comparative analysis of the properties for polyfluoroaniline（PFAN）,PANI and Poly（An-FAn） was proceeded. The results showed that copolymerization ofAn and FAn in the emulsion system was an effective way to significantly improve thesolubility of polymer based on effectively maintain its conductivity. Whenn（An）/n（FAn）=2/1, m（K₂Cr₂O₇）/m（An-FAn）=0.5/1, m（SDBS）/m（An-FAn）=3/1, reactiontime was10h, the properties of Poly（An-FAn） can achieve best value.③The microemulsion system of （SDBS/TX-100）/nBA/（An-FAn）/HCl wasprepared which using sodium dodecyl benzene sulfonate （SDBS） and polyglycoloctylphenyl ether （TX-100） as composite emulsifier, n-butyl alcohol （nBA） as auxiliaryemulsifier. The effects of the mass ratio of composite emulsifier to assistant emulsifier[ωm=m（SDBS/TX-100）/m（nBA）] and the mass ratio of composite emulsifier SDBS toTX-100[ωs=m（SDBS）/m（TX-100）] on the phase behavior were investigated by apseudo ternary phase diagram of （SDBS/TX-100）/nBA/（An-FAn）/HCl. The resultsshowed that with the increase of ωmthe area of microemulsion region of（SDBS/TX-100）/nBA/（An-FAn）/HCl increased initially and then decreased, whenωm=1.75has maximum value, with the increase of TX-100, the area of microemulsion region increased gradually.④Using APS as oxidant, through microemulsion polymerization synthesisPoly（An-FAn）. The properties of copolymer were analyzed and characterized by yield,solubility experiment and four-points-probe technique. The structure and properties ofthe copolymer synthesized by different methods were also studied. When ωs=1/3,m（E）/m（An-FAn）=3/1, n（An）/n（FAn）=1/1, m（APS）/m（An-FAn）=2/1, reaction time was8h, the properties of Poly（An-FAn） reached the optimum value, the solubility ofpolymer is enhanced significantly while maintaining higher conductivity. In addition,the poly（An-FAn） synthesized by microemulsion polymerization shows more excellentstructure and properties compared to the copolymer synthesized in solution andemulsion system.