The effect of synthesis conditions on the properties of polyaniline film

Summary form only given. The effects of oxidant(ammonia persulfate)/aniline ratio and reaction temperature on the yield, oxidation state, solubility in NMP and the properties of the films made from NMP solution were studied. The yields of polyaniline reach a maximum when oxidant/aniline ratio equals to 1.25 and reaction temperature is -5 C. The solubilities of polyaniline base form also reach a maximum at oxidant/aniline ratio of 1.25 and reaction temperatures of -5 C and 0 C. The ratios of benzene ring and quinoid ring are the same for polyaniline synthesized with oxidant/aniline ratio lower than 1.25. When the ratio of oxidant/aniline is higher than 1.75, the film can hardly be formed from NMP solution. Polyaniline films can be stretched to higher ratio when oxidant/aniline ratios are lower and reaction temperatures are -5 C and 0 C. Thermal stability and mechanical strength of polyaniline increase in the presence of a small amount of NMP.