Electropolymerisation and properties of conducting polymers derived from aminobenzenesulphonic acids and from mixtures with aniline

Abstract

The electrochemical polymerisation of 2-and 4-aminobenzenesulphonic acids (orthanilic acid and sulphanilic acid) in sulphuric acid solution and co-polymerisation of mixtures of aniline and acid monomers, have been systematically investigated. The polymers formed have been characterised voltammetrically. Further evidence concerning the polymer structure and chemical composition has been obtained by IR spectroscopy and scanning electron microscopy (SEM). #

Conducting polymers from aminobenzoic acids and aminobenzenesulphonic acids: influence of pH on electrochemical behaviour

“…5 and 6 the trends are similar to those obtained from the polymerisation of the substituted anilines alone. As discussed previously [48,52], there is good evidence for incorporation of polymer chains of the substituted monomer with polyaniline chains. Nevertheless, although aniline shows higher capacities than the films formed from aniline plus aminobenzoic acid monomers in acid solution this is not the case for aminobenzenesulphonic acids.…”

“…[48,52] between potential limits to be specified below, for 30 cycles at a scan rate of 50 mV s (1 , using an analogue potentiostat constructed in this laboratory. For polymerisation of the aminobenzoic and aminobenzenesulphonic acids alone, a 0.05 M solution was used in 0.5 or 1.0 M H 2 SO 4 .…”

“…The films formed from substituted anilines also lead to compact films [48,52]. An example of the morphology of films formed by polymerisation of substituted anilines in sulphuric acid solution is given for poly(2-ABA) in Fig.…”

“…The electropolymerisation of carboxylate-substituted anilines (2-, 3-and 4-aminobenzoic acids (2-, 3-and 4-ABA, respectively)) [48] and sulphonate-substituted anilines (2-and 4-amino-benzene sulphonic acids (2-and 4-ABS, respectively)) [52] in sulphuric acid solution has recently been investigated by us. Polymer films were formed on glassy carbon substrates using cyclic potential sweep synthesis, and were characterised in sulphuric acid solution by cyclic voltammetry (CV).…”

“…Polymerisation of mixtures of aniline and the substituted aniline in different ratios was also carried out [48,52]. It was shown that aniline polymerisation dominates although the morphology of the films formed is changed from that of polyaniline alone by the presence of the substituted monomer and there is evidence from CV, chromatic properties and IR spectroscopic characterisation of the existence of both components.…”