Jy. Lee et al., MODIFIED POLYANILINE THROUGH SIMULTANEOUS ELECTROCHEMICAL POLYMERIZATION OF ANILINE AND METANILIC ACID, Journal of electroanalytical chemistry [1992], 360(1-2), 1993, pp. 177-187
Simultaneous electropolymerization of aniline and metanilic acid in aq
ueous HClO4 leads to a copolymer similar to that obtained by direct su
lfonation of polyaniline. Characterization by electrochemical and spec
troscopic methods (UV-visible, Fourier transform IR and proton NMR) in
dicated the presence of polyaniline linear chains in which metanilic a
cid units were inserted as spacers. Elemental analysis showed that the
copolymer was 40% doped by the sulfonate side-groups intramolecularly
(self-doping) and 20% doped by ClO4- intermolecularly. The presence o
f sulfonate functional groups decreased electronic conductivity and in
creased solubility in alkaline solvents, but the electrochemical prope
rties remained principally that of polyaniline.