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Title: Pattern formation and oscillatory electropolymerization of thiophene
Authors: Das, Ishwar
Agrawal, Namita Rani
Ansari, Shoeb A
Gupta, Sanjeev Kumar
Issue Date: Dec-2008
Publisher: CSIR
Abstract: Thiophene has been electrochemically polymerized using organic and inorganic oxidizing agents, 4-toluene sulphonic acid silver salt and perchloric acid, in the absence and presence of ZnSO₄. Electropolymerized aggregates have been characterized by morphological studies, growth kinetics, powder X-ray diffraction, differential scanning calorimetry, thermogravimetry and direct analysis in real time mass spectroscopy measurements. It is found that physical characteristics and morphology of polythiophene depend on the nature and concentration of the anion and field intensity. Morphologies of polymer aggregates using the silver salt of 4-toluene sulphonic acid and HClO₄ are fibrillar and compact respectively. Transitions in morphology have also been observed when doped with ZnSO₄. Growth kinetics during electropolymerization of thiophene has also been studied at different thiophene concentrations, field intensity, and concentrations of oxidizing agents as well as in the presence of ZnSO₄. Growth rate is found to be higher with HClO₄ than with 4-toluene sulphonic acid silver salt. Polymer obtained by using the silver salt is thermally more stable and of low molecular weight (416) than that obtained with HClO₄ (689). During electropolymerization, change in anode potential is observed and has been monitored as a function of time. Correlation between morphology and oscillatory behaviour has been studied.
Page(s): 1798-1803
ISSN: 0376-4710
Appears in Collections: IJC-A Vol.47A(12) [December 2008]

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