At. Royappa et al., Synthesis of sulfonated polyaniline by polymerization of the aniline heterodimer 4-aminodiphenylamine-2-sulfonic acid, SYNTH METAL, 123(2), 2001, pp. 273-277
The aniline heterodimer 4-aminodiphenylamine-2-sulfonic acid has been polym
erized in aqueous ammonium persulfate solution to yield a new form of sulfo
nated polyaniline (SPAn). This polymer, obtained as a green powder, is solu
ble in aqueous base (violet solution) and polar solvents ( green solution,
turning blue on standing). Its FTIR, UV-VIS and EPR spectra are quite simil
ar to those of SPAn obtained by direct ring-sulfonation of polyaniline. The
room temperature dc conductivity of the polymer is about 1.3 x 10(-5) S/cm
, indicative of considerable disorder in the sample. Cyclic voltammetry in
1.0 M HCl shows two redox peaks at E-1/2.1 = 0.50 V and E-1/2.2 = 0.68 V ag
ainst Ag/AgCl electrode, characteristic of SPAn. (C) 2001 Elsevier Science
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