Solution properties of polyaniline (PAn) doped by camphorsulfonic acid
(CSA) were examined. PAn-CSA behaves like a polyelectrolyte to differ
ent extents depending on the solvent used. In an m-cresol/chloroform s
olution, PAn-CSA exhibits an expanded chain conformation because of it
s polyelectrolytic properties. Dilute and concentrated solution proper
ties of PAn-CSA indicate that PAn-CSA is a semirigid polymer which has
strong interchain interactions.