For an organic and polymer chemistry experiment for students in university and college of technology, synthesis of conducting polymers was attempted. Three conductive polymers, polyaniline, poly (o-phenylenediamine) and poly (N-methylaniline) , were prepared by oxidative polymerizations of the corresponding monomers. Among four oxidizing agents, K2Cr2O7, KIO3, FeCl3 and (NH4) 2S2O8, (NH4) 2S2O8 was turned out to be the best oxidizing agent for the polymerizations. The polymerizing solutions gradually colored because of the formation of colored oligomers, which was monitored with the absorption spectra measured during the polymerizations. Since the time for experiment was limited, the molar ratio of [ (NH4) 2S2O8] to [monomer] was taken 2 : 1. The experiment was demonstrated in the organic and polymer chemistry experiments and was evaluated by students as well as teachers.
