Stability of Polyaniline Aqueous Dispersions Prepared in the Presence of Surfactant Mixtures

Resumo

Aqueous dispersions of doped polyaniline were synthesized in the presence of mixtures of a carboxylcontaining polymeric surfactant with low- and high-molecular-mass stabilizers. Polyaniline aqueous dispersions obtained using a mixture of carboxyl-containing polymeric and low-molecular-mass surfactants are characterized by high dispersity and narrow particle-size distribution but low sedimentation stability. The doping agent influences the stability of the dispersions prepared in the presence of polymeric and low-molecular-mass surfactants. The dispersions obtained using a mixture of macromolecular surfactants are characterized by larger particle size but higher sedimentation stability due to increased viscosity of the system.