Peroxidic perfluoropolyether from tetrafluoroethylene oxidation: micro structural analysis by NMR spectroscopy and mechanistic considerations

Guarda, P.A.; Barchiesi, Emma; Fontana, Giovanni; Petricci, Silvia; Pianca, Maurizio; Marchionni, G.

doi:10.1016/j.jfluchem.2004.11.012

Cited by 16 publications

(15 citation statements)

References 12 publications

(24 reference statements)

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“…The experimental B L values were obtained from the 19 F NMR components N N (-OOCF 2 CF 2 OOCF 2 CF 2 OO-) and N F (-OOCF 2 CF 2 OOCF 2 CF 2 OCF 2 -) according to the equation B L = (N N / N F ) + 2, as previously reported [11]. The obtained values are plotted in Fig.…”

Section: Synthesis and Structural Analysismentioning

confidence: 83%

“…Composition and molecular weight data are reported in Table 2; the dyads and triads were calculated as previously reported [11]. It is possible to see that the C 1 units are substantially absent for X P above 0.6 (PO % 8) and these polymers can be well described by the formula:…”

Section: Synthesis and Structural Analysismentioning

confidence: 86%

“…As a consequence of the reaction mechanism the -CF 2 -units (C 1 ), which derive from radical b-fragmentation reactions, are abundant in polymers with low peroxide content, whereas they become less and less abundant as the peroxide content increases [11].…”

Section: Synthesis and Structural Analysismentioning

confidence: 99%

“…Calculations of the polymer structure were done according to the previously reported algorithms [11].…”

Section: Calculations and Kinetic Modelmentioning

confidence: 99%

See 3 more Smart Citations

Synthesis and characterization of poly(tetrafluoroethyleneperoxides)

Guarda

Petricci

Fontana

et al. 2009

Journal of Fluorine Chemistry

Self Cite

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Section: Synthesis and Structural Analysismentioning

confidence: 83%

Section: Synthesis and Structural Analysismentioning

confidence: 86%

Section: Synthesis and Structural Analysismentioning

confidence: 99%

“…Calculations of the polymer structure were done according to the previously reported algorithms [11].…”

Section: Calculations and Kinetic Modelmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis and characterization of poly(tetrafluoroethyleneperoxides)

Guarda

Petricci

Fontana

et al. 2009

Journal of Fluorine Chemistry

Self Cite

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“…Practically, this oxypolymerization can be activated either by high energy UV light or by employing elemental fluorine or perfluoroalkyl hypofluorites, especially CF 3 OF, as chemical initiators [9]. The peroxidic polymer is the result of a complex free radical oxidation reaction dominated by the chemistry of perfluoro oxyradicals [10]. The composition and the reaction yields of forming PFPE polymers depend on irradiation condition, TFE concentration, fluid dynamics of the system and other classical physical parameters like temperature and pressure.…”

Section: Oxypolymerization Of Perfluoroolefinmentioning

confidence: 99%

An Environmentally Friendly Class of Fluoropolyether: α,ω-Dialkoxyfluoropolyethers

Navarrini

Spataro

et al. 2012

Applied Sciences

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Abstract:The α,ω-dialkoxyfluoropolyethers (DA-FPEs) characterized by the structure R H O(CF 2 CF 2 O) n (CF 2 O) m R H have been developed as a new class of environmentally friendly hydrofluoroethers (HFEs) suitable as solvents, long-term refrigerants, cleaning fluids, and heat transfer fluids. Synthetic methodologies for DA-FPEs described here consist of radical-initiated oxypolymerization of olefin, peroxy-elimination reaction in peroxidic perfluoropolyethers (P-PFPEs) and further chemical modification of α,ω-diacylfluoride PFPE. The physical properties of selected α,ω-dimethoxyfluoropolyethers (DM-FPEs) have been evaluated and compared with analogous hydrofluoropolyethers (HFPEs) having -OCF 2 H as end-groups. Atmospheric implications and global warming potentials (GWPs) of selected DA-FPEs are also considered.

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Innovative Perfluoropolyether‐Functionalized Gas Diffusion Layers with Enhanced Performance in Polymer Electrolyte Membrane Fuel Cells

et al. 2020

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In this work, perfluoropolyether (PFPE) functionalization was used as hydrophizing treatment for gas diffusion layers (GDLs) in polymer electrolyte membrane fuel cells (PEMFCs), instead of standard PTFE coatings, aiming to enhance the hydrophobicity of the gas diffusion media and to reduce the mass transfer limitations in the final device. Carbon cloth diffusion layers and carbon black were functionalized by decomposition of a PFPE peroxide. PFPE-functionalized carbon black was employed in the preparation of an ink suitable for obtaining microporous layers (MPLs) by deposition onto macroporous backing layers. Dual-layer gas diffusion media showing superhydrophobic behavior due to different hydrophobizing treatments were compared with conventional PTFE-based materials, by testing in a single PEMFC working at two different temperatures and at low and high relative humidity conditions. Such tests demonstrated improved performances over conventional GDLs for pure PFPE-based samples in terms of both overall electrical performance and reduced diffusive limitations in high current density conditions. The maximum output power achieved with the novel PFPE-based compounds was 460 mW cm -2 at 80°C and relative humidity (RH) 100% while the best improvement (10%) with respect to conventional GDLs was realized at 80°C and RH 60%.

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Peroxidic perfluoropolyether from tetrafluoroethylene oxidation: micro structural analysis by NMR spectroscopy and mechanistic considerations

Cited by 16 publications

References 12 publications

Synthesis and characterization of poly(tetrafluoroethyleneperoxides)

Synthesis and characterization of poly(tetrafluoroethyleneperoxides)

An Environmentally Friendly Class of Fluoropolyether: α,ω-Dialkoxyfluoropolyethers

Innovative Perfluoropolyether‐Functionalized Gas Diffusion Layers with Enhanced Performance in Polymer Electrolyte Membrane Fuel Cells

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