The undoped and doped polyaniline were prepared by chemical oxidative polymerization method,using aniline as the reactive monomer,HEDP as the dopant and ammonium peroxydisulfate as the oxidant. The effects of the ratio of raw materials,reaction temperature and reaction time on the resistivity and yield of HEDP-PANI were studied. The effect of heat treatment temperature on the resistivity of HEDPPANI was discussed. The molecular structure and aggregation structure of HEDP-PANI were measured by infrared spect...