Abstract
Poly(phenylene sulfide phenyleneamine), PPSA, is a copolymer of poly(aniline) and poly(phenylene sulfide), soluble in conventional organic solvents as tetrahydrofuran, dimethyl sulfoxide, dimethylformamide, and cyclohexanone. In this research, its electrochemical behavior has been studied in acetonitrile in the presence of different electrolytes, where the loss of electroactivity was observed after few cycles. In this paper, the charge compensation dynamics of PPSA is analyzed through electrochemical quartz crystal microbalance experiments and electroacoustic impedance measurements. Raman spectroscopy data have shown that once the oxidation of the sulfur atom occurs, a loss of electroactivity is observed, being not possible to recover the pristine state of the polymer. Fourier transform infrared (FTIR) and X-ray diffraction (XRD) data obtained for the fully oxidized polymer are consistent with the formation of a networked polymer due to the electrophilic attack of the positive sulfur atom on the activated aromatic rings. Electrochemical quartz crystal microbalance results clearly show that the degree of irreversibility fully depends on the chemical nature of the anions with a negligible participation of the cations of the electrolytic solution.
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Acknowledgment
This work was supported by FAPESP (03/10015-3) and CNPq. We also thank the Laboratorio de Espectroscopia Molecular (IQ-USP) for Raman facilities.
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This work is in memoriam of Prof. Dr. Francisco C. Nart, dearest friend and colleague, whose scientific skills and enthusiasm will always be remembered.
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Bazito, F.F.C., Córdoba de Torresi, S.I. & Torresi, R.M. Charge compensation dynamics in a soluble copolymer of poly(aniline) and poly(phenylene sulfide). J Solid State Electrochem 11, 1471–1479 (2007). https://doi.org/10.1007/s10008-007-0303-7
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DOI: https://doi.org/10.1007/s10008-007-0303-7