Synthesis and Characterization of Soluble Polyaniline and Its Derivatives Doped with Dialkylsulfates

Abstract Soluble polyaniline and its derivatives doped with dialkylsulfate (DAS : dimethylsulfate, diethyl sulfate, dipropylsulfate etc.) were chemically synthesized. Solubilities of polyaniline doped with DAS (PANI·DAS) powders in polar solvents and polyethoxy aniline doped with DAS (PEtOANI·DAS) powders in various alcohols were observed in the range of 3–8 wt.% and 2–5 wt.%, respectively. This improved solubility in organic polar solvents was explained with the interactions between the hydrophilic sulfonate group, polar substituent and polar solvents. Compared to that of HCl doped polyaniline, PANI·DAS showed improved thermal stability upon heat treatment at 160 °C. The electrical conductivities of PANI·DAS and PEtOANI·DAS films appeared in the range of 1.2∼2.3 S/cm and 10−2∼10−4 S/cm, respectively.