Oxidative Chemical Polymerization of Ortho-Tolidine in Acid Medium Using K2Cr2O7 as Oxidizing Agent and Characterization of the Obtained Polymer
Abstract: Potassium dichromate initiated polymerization of o-tolidine in acidified aqueous medium was carried out. The effects of potassium dichromate, hydrochloric acid and monomer concentrations on the polymerization reaction were investigated. The order of reaction with respect to potassium dichromate, hydrochloric acid and monomer concentration was found to be 0.927, 0.984 and 1.086 respectively. Also, the effect of temperature on the polymerization rate was studied and the apparent activation energy of the polymerization reaction was found to be 59.26 kJ/mol. A molecular mechanism for the oxidation of o-tolidine using potassium dichromate is proposed. This mechanism explains the specific features of o-tolidine oligomerization and polymerization. The obtained polymer was characterized using XPS, IR, UV-visible and elemental analysis. The surface morphology of the obtained polymers was characterized by X-ray diffraction and transmission electron microscopy (TEM). The TGA analysis was used to confirm the proposed structure and number of water molecules in each polymeric chain unit. The ac conductivity (?ac) of (POTO) was investigated as a function of frequency and temperature. The microscopic conduction mechanism of charge carries over the potential barrier in polymer backbone is classical hopping model.
[Said. M. Sayyah, Ahmed A.Aboud, Amgad. B. Khaliel and Salama.M.Mohamed (2014); Oxidative Chemical Polymerization of Ortho-Tolidine in Acid Medium Using K2Cr2O7 as Oxidizing Agent and Characterization of the Obtained Polymer Int. J. of Adv. Res. 2 (6). 0] (ISSN 2320-5407). www.journalijar.com
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