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Synthesis and Properties of Polyaniline with Different Wettability

HUANG Jue-xin;ZHANG Yi;ZHANG Bin;DAI Si-yue;YAN Xiu-ling;College of Chemistry and Environmental Science,Yili Normal University;  
Polyaniline(PANI)with different wettability was synthesized by emulsion polymerization using sodium dodecyl sulfate(SDS),hexadecyl trimethyl ammonium bromide(CTMAB),poly(ethylene oxide)(PEG)as dispersants.Influence of different types of dispersants on the performance of PANI was studied.The PANI was analyzed by Scanning Electron Microscopy(SEM),X-Ray Diffraction(XRD),Water Contact Angle(WCA),FT-IR spectra,UV-Vis spectra,laser particle size analyzer,etc.The electrochemical performance was researched by circulation current-voltage,AC impedance experiments.Results showed that each sample of PANI was doped with hydrochloric acid,the hydrophilicity of PANI using PEG as the dispersant was the best,CTMAB was the second and SDS was the worst.Using PEG as a dispersant can reduce the particle size of PANI and improve the regularity as well as the conductivity of PANI.The hydrophilic head group of anionic dispersant SDS is negatively charged,which is easy to be adsorbed to the proton acid doped PANI.Then the hydrophobic group of SDS outward the PANI,resulting a hydrophobic surface.PANI synthesized in the presence of SDS with bigger particle size has the lowest conductivity.The hydrophilic head group of cationic dispersant CTMAB is positively charged,the presence of CTMAB is not conductive to doping reaction of PANI with proton acid,and the charge transfer impedance of PANI is high.
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