Please use this identifier to cite or link to this item: https://doi.org/10.1016/0032-3861(96)87274-0
Title: The protonation-deprotonation hysteresis in polyaniline
Authors: Kang, E.T. 
Neoh, K.G. 
Tan, K.L. 
Keywords: Hysteresis
Polyaniline
Protonation-deprotonation
Issue Date: Mar-1996
Citation: Kang, E.T., Neoh, K.G., Tan, K.L. (1996-03). The protonation-deprotonation hysteresis in polyaniline. Polymer 37 (6) : 925-929. ScholarBank@NUS Repository. https://doi.org/10.1016/0032-3861(96)87274-0
Abstract: The changes in intrinsic oxidation state ([-N-] and [-NH-] content) and protonation level ([N+]/[N] ratio) of emeraldine (EM) base powders as a function of protonic acid loadings resulting from the protonation-deprotonation cycle have been assessed quantitatively by X-ray photoelectron spectroscopy. A hysteresis effect was observed for the protonation-deprotonation cycle involving HCl, but not for H2SO4. The hysteresis has been attributed in part to covalent HCl addition to the polymer and the associated reduction in intrinsic oxidation state. A hysteresis effect involving a significant increase in intrinsic oxidation state was observed in the once acid-base cycled EM films cast from N-methylpyrrolidinone, but not for powders. The phenomenon has been attributed to the more efficient hydrolysis of powder samples in aqueous acid media due to the large effective surface area.
Source Title: Polymer
URI: http://scholarbank.nus.edu.sg/handle/10635/91765
ISSN: 00323861
DOI: 10.1016/0032-3861(96)87274-0
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