Polypyrrole (PPy) dispersions are prepared at room temperature by oxidative polymerization using FeC13 oxidant in the presence of poly(vinyl methyl ether) (PVME) as stabilizer, and ethanol or aqueous ethanol as the dispersion medium. With water as dispersion medium, lower temperatures are required when the solvent property of water towards the PVME stabilizer becomes good enough to effect steric stabilization. PPy prepared in 50% ethanol or in water exhibits high specific conductivity, about 10 S cm- 1, while PPy prepared in ethanol under similar conditions has a conductivity two to four decades lower, depending on the FeCI3 concentration and temperature used in the preparation. Transmission electron micrographs of PPy reveal that the particles are spherical but polydisperse.
Посилання на статтю:
Dispersion polymerization of pyrrole using poly(vinyl methyl ether) as stabilizer / M. L. Digar, S. N. Bhattacharyya and B. M. Mandal // Polymer. – 1994. – Vol 35. – P. 377-382.