Polyaniline dispersions 10. Coloured microparticles of variable density prepared using stabilizer mixtures

Green polyaniline microparticles of variable density were prepared by the d ispersion polymerization of aniline in the presence of a mixture of steric stabilizers. A water-soluble polymer stabilizer, polyacrylamide, and a part iculate one, colloidal silica, were jointly used for this purpose. Silica w as preferentially incorporated into the dispersion particles. The size of t he particles was determined by dynamic light scattering. The colour of the polyaniline colloids was characterized by the absorption spectra. The densi ty of the particles increased with increasing silica content, while the con ductivity of the composites prepared from dispersions was reduced at the sa me time.