Abstract: Polypyrrole was synthesized by chemical oxidative polymerization.Its morphology was characterized by SEM and TEM,and its conductivity was measured by a four-probe instrument.Influences on its conductivity and conducting mechanism were studied.It was found that the conductivity and morphology are greatly influenced by the amount of oxidant,reaction temperature and time,and the kind of dopants.The conductivity of polypyrrole doped with BSNa was the highest under the condition of molar tation of FeCl3/Py 1.0,for a reaction time of 0.5h in an ice-bath.It was shown that the polymer chain of the fiber PPy-NSA was identical to that of PPy doped with other sulfonic dopants.The higher conductivity of polypyrrole was due to its doping condition,the narrow gap between the conduction band and valence band,the freer movement of current carriers,and the doping-undoping of anions.

Key words: polypyrrole, chemical oxidative polymerization, conductivity, conducting property, conducting mechanism, dopant