چكيده لاتين :
POlyaniline (PANI) doped with dodecyl benzene suiphonic acid (OBSA) was
directly synthesized by aniline polymerization in the presence of OBSA in an
aqueous medium. The temperature and colour changes of the polymerization
reaction were carefully recorded and found that the polymerization of aniline begins
after 80 min with changing reaction colour from white to pale blue. Fourier transform
infrared (FTIR), elemental analysis, thermogravimetric analysis (TGA), differential
scanning calorimetry (OSC) and X-ray diffraction (XRO) techniques were used to characterize
and analyze the thermal characteristics of the doped PANI sample. In the
FTIR spectrum, the peak related to NW...S03י interactions between the polymer
chain and the dopant appeared at 1026 cm,1. The obtained TGA curve has illustrated
three major stages in the weight loss of the doped PANI. These three weight loss
stages were accounted to the evaporation of moisture, evaporation of OSSA, and the
chemical structure degradation of PANI. The moisture, OBSA, and PANI contents of
the product were calculated from TGA curve and it was shown that approximately 6.65
aniline repeating units have been doped with one OBSA molecule. The ose thermogram
has shown two endothermic peaks around 1200e and 2800e due to the evaporations
of moisture and OBSA, respectively. The analysis of XRO spectra confirmed
that a chemical cross-linking reaction occurs between the PANI chains during thermal
treatment and increases the amorphous state of the sample. The resultant electrical
conductivity examination at the heating temperature of 1000e has shown that at the
heating time of 30 min the doped PANI possessed maximum electrical conductivity
which decreased by increase in heating time.
