oxalic acid on oxidation will give carbon dioxide, avoid

use sulphuric acid

niline and pyrrole copolymers were synthesized for

different monomer ratios from a mixed

electrolyte containing 0.1M oxalic acid and 0.1M do

decyl benzene sulphonic acid (DBSA) using a 4-

step electrochemical method. Results were compared

to those obtained for polymers prepared from an

electrolyte of oxalic acid only. It was found that

the presence of DBSA increases the polymerization

rates for polymer deposited from the mixed monomer

electrolytes, but not for the homopolymers. For

copolymers deposited from monomer mixtures of high

aniline content, deposition rates were generally

low, due to the low conductivity of these samples.

FTIR and cyclic voltammetry results confirm the

presence of both monomers in the polymers deposited

from the mixed electrolyte, and FTIR indicates

that copolymers, rather than mixtures, are formed.

Results from AC impedance spectroscopy show that

the presence of DBSA results in an increased double

layer capacitance for the homopolymers and

increased low frequency capacitance for those sampl

es with low pyrrole content.

http://www.electrochemsci.org/papers/vol3/3091065.pdf