The kinetics of DBSA-doped polyaniline film formation in a constant magnetic field (0.6 T)

Polyaniline (PANI) doped with dodecylbenzene sulfonic acid (DBSA) was synthesized by emulsion polymerization using ammonium persulfate (APS) as oxidant in the presence of a constant magnetic field (0.6T). The kinetics of the PANI film formation was investigated by the quartz crystal microbalance (QCM) technique. The reaction exhibited first order with respect to aniline and half-order to APS and DBSA. The effects of temperature and different magnetic field intensity on the film growth rate were investigated. The activation energy calculated from the temperature dependence of the growth rate was 40.4KJ/mol. It was observed from the plot of the PANI film growth rate versus the magnetic field intensity that the growth rate increased with the increasing magnetic intensity. The UV-visible spectra of the PANI polymerization was measured and compared to the polymerization process of the PANI using the QCM technique. The result showed that the absorption intensity of the PANI polymerized in the presence of a magnetic field was greater than that of the PANI polymerized in the absence of a magnetic field at the same time.