Membrane-derived fluorinated radicals detected by electron spin resonance in UV-irradiated Nafion and Dow ionomers: Effect of counterions and H(sub 2)O(sub 2)
Article Abstract:
Electron spin resonance spectroscopy was used to detect and identify radicals formed by UV irradiation of Nafion and Dow perfluorinated membranes partially or fully neutralized by Cu(II), Fe(II), and Fe(III). The major conclusion obtained was that cations were involved in degradation process where the point of attack appears to be at or near the pendant chain of the ionomer.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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Determining the geometry and magnetic parameters of fluorinated radicals by simulation of powder ESR spectra and DFT calculations: The case of the radical RC[F.sub.2]C[F.sub.2]. in nafion perfluroinated ionomers
Article Abstract:
The geometry and magnetic properties of fluorinated radicals RC[F.sub.2]C[F.sub.2] in nafion perfluroinated ionomers were determined by ESR spectra and DFT calculations. The ESR spectrum was accurately simulated by an automatic fitting procedure and DFT calculations supported the pyramidal structure determined by fitting the experimental ESR spectrum.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2007
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Nafion perfluorinated membranes treated in Fenton media: radical species detected by ESR spectroscopy
Article Abstract:
ESR spectroscopy is used to detect and identify radicals in Nafion perfluorinated membranes exposed to the Fenton reagent based on Ti(super 3+). In the Fenton reagent (TiCl3 + hydrogen peroxide, no Nafion) radicals were detected only for high concentrations of hydrogen peroxide, 30 percent w/v.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
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