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dc.titleStructural changes associated with thermal and chemical treatment of polythiophenes doped with perchlorate
dc.contributor.authorNeoh, K.G.
dc.contributor.authorKang, E.T.
dc.contributor.authorTan, K.L.
dc.identifier.citationNeoh, K.G.,Kang, E.T.,Tan, K.L. (1991). Structural changes associated with thermal and chemical treatment of polythiophenes doped with perchlorate. Polymer Degradation and Stability 31 (1) : 37-49. ScholarBank@NUS Repository.
dc.description.abstractElectrically conductive polymers have been synthesized by the reaction of 3-methylthiophene or 2,2′-bithiophene with ferric perchlorate. With copper perchlorate, only 2,2′-bithiophene undergoes simultaneous polymerization and oxidation. Neither ferric perchlorate nor copper perchlorate reacts with thiophene to yield a conducting polymer. X-ray photoelectron spectroscopy of the perchlorate doped polythiophenes indicates that, depending on the perchlorate used, a significant amount of the chlorine may be covalently bonded to the polymer. Treatment of the doped samples with methanol results in the ClO4 - S ratio decreasing to one-third of the pristine value. Treatment with NaOH results in almost complete removal of the ClO4 - anions in poly(bithiophene) synthesized with Fe(ClO4)3. 9H2O. Concurrent with the loss of ClO4 - anions is the decrease in electrical conductivity. The undoped polymer has a high degree of thermal stability while the decomposition of the doped polymer appears to be initiated by the decomposition of the ClO4 - anions. Prolonged heating of the doped samples at 150°C results in the conversion of ClO4 - anions to Cl covalently bonded to the polymer and to volatile species which are lost from the polymer. © 1990.
dc.contributor.departmentCHEMICAL ENGINEERING
dc.description.sourcetitlePolymer Degradation and Stability
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