density prepared using light stabilizer mixtures

Green polyaniline microparticles of variable density were prepared by the dispersion polymerization of aniline in the presence of a mixture of steric light stabilizers. A water-soluble polymer stabilizer, polyacrylamide, and a particulate one, colloidal silica, were jointly used for this purpose. Silica was preferentially incorporated into the dispersion particles. The size of the particles was determined by dynamic light scattering. The colour of the polyaniline colloids was characterized by the absorption spectra. The density of the particles increased with increasing silica content, while the conductivity of the composites prepared from dispersions was reduced at the same time.