Suitability of some fluoropolymers used as base films for preparation of polymer electrolyte fuel cell membranes

Chen, Jin Hua; Asano, Masaharu; Maekawa, Yasunari; Yoshida, Minoru

doi:10.1016/j.memsci.2005.10.036

Cited by 94 publications

(68 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We selected a relatively high dose in order to minimize the penetration of grafting, yet sufficiently low to avoid dramatic deterioration of mechanical properties. 35 In order to simplify the analysis of wettability and synthetic conditions for grafting, we decided to initially use FEP polymer films as a model system (Figure 1). Since the hydrophilization treatment of our method is based on only coating modifications, it can be assumed that carbon fibers remain unaltered.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Advanced Water Management in PEFCs: Diffusion Layers with Patterned Wettability

Forner‐Cuenca

Manzi-Orezzoli

Biesdorf

et al. 2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

A novel type of fuel cell gas diffusion layer with patterned wettability is herein reported. The production of hydrophilic patterns by radiation grafting depends on two main steps: electron beam activation and polymerization reaction. In this first part of the series, we are giving extensive details about the synthetic routes for modifying porous media's wettability. Two monomers (acrylic acid and N-vinylformamide) were used for the hydrophilization of the fluoropolymer and a parametric study was performed. Finally, a preliminary thermal degradation study was carried out. We found conditions to produce hydrophilic gas diffusion layers with short reaction times (about 10 minutes) and proved that the synthetic method is suitable for creating local modifications. For hydrophilic surfaces, the coating load significantly impacts wetting dynamics.

show abstract

Section: Methodsmentioning

confidence: 99%

“…35 MeV, a beam current in the range of 0 to 35 mA and a scan width of 1220 mm. Materials were mounted on metallic trays that were conveyed into the irradiation chamber.…”

Section: Methodsmentioning

confidence: 99%

Advanced Water Management in PEFCs: Diffusion Layers with Patterned Wettability

Forner‐Cuenca

Manzi-Orezzoli

Biesdorf

et al. 2016

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…[18,20] The presence of a correlation peak, which we identify as the so-called crystalline domain peak, indicates a characteristic http://doc.rero.ch length in the morphology, defined by the alternation of the amorphous and crystalline phase. However, the spatial correlation is not sustained but has finite extent, because we do not observe any Bragg-singularity but only one broad correlation peak.…”

Section: Discussion Of Base and Grafted Filmsmentioning

confidence: 99%

Correlation between Morphology, Water Uptake, and Proton Conductivity in Radiation Grafted Proton Exchange Membranes

et al. 2010

View full text Add to dashboard Cite

A small-angle neutron scattering (SANS) investigation of saturated aqueous proton exchange membranes is presented. Our membranes were synthesized by radiation-induced grafting of poly(ethylene-alt-tetrafluoroethylene) (ETFE) with styrene in the presence of crosslinker (divinylbenzene, DVB) and the polystyrene was sulfonated subsequently. The contrast variation method was used to understand the relationship between morphology, water uptake, and proton conductivity. We find that the membranes are separated into two phases, mostly following the morphology already defined in the semi-crystalline ETFE base film. The amorphous phase hosts the water and swells upon hydration, swelling being inversely proportional to the degree of crosslinking. Proton conductivity and volumetric fraction of water are related by a power law, indicating a percolated and most likely random network of finely dispersed aqueous pores in the hydrophilic domains.

show abstract

“…3,4 In contrast to nonpolar fully fluorinated polymers, partially fluorinated polymers can be dissolved in polar solvents, such as organic esters and amines, and readily melt-processed by the standard method of molding and extrusion. 5 In particular, PVDF, with its high polarity, also possesses outstanding thermal, chemical, and mechanical stabilities, which has led to its widespread use in various applications, such as hybrid nanocomposite membranes, 6 electrochemically stable electrolytes for lithium batteries, [7][8][9] fuel cell membranes based on Nafion-PVDF blends, [10][11][12] and piezoelectric sensor materials utilizing its ferroelectric and pyroelectric properties. [13][14][15] Although PVDFbased materials serve as highly stable membranes, polymer electrolytes, and even sensor materials, the characteristic surface wettability of PVDF must be adequately understood to design next-generation PVDF-based materials and devices with enhanced performance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Wettability of Partially Fluorinated Polymers Reveals the Surprisingly Strong Acid-Base Character of Poly(vinylidene Fluoride)

Lee¹,

Park²,

Lee³

2011

Bulletin of the Korean Chemical Society

View full text Add to dashboard Cite

The wettabilities of the partially fluorinated polymers (ethylene-tetrafluoroethylene copolymer (ETFE), ethylenechlorotrifluoroethylene copolymer (ECTFE), and poly(vinylidene fluoride) (PVDF)) were investigated by contact angle measurements. Zisman plots for ETFE and ECTFE exhibited linear relationships, while the Zisman plot for PVDF showed a slight curvature, which was interpreted to indicate strong non-dispersive interactions between the surface and the contacting liquids. The Lifshitz-van der Waals forces of the fluoropolymers were estimated to increase in the order of ETFE < PVDF << ECTFE. An evaluation of the polar or "acid-base" interaction energies showed that PVDF, which possesses the most acidic hydrogens among the examined fluoropolymers, has the strongest acid-base interactions.

show abstract

Suitability of some fluoropolymers used as base films for preparation of polymer electrolyte fuel cell membranes

Cited by 94 publications

References 35 publications

Advanced Water Management in PEFCs: Diffusion Layers with Patterned Wettability

Advanced Water Management in PEFCs: Diffusion Layers with Patterned Wettability

Correlation between Morphology, Water Uptake, and Proton Conductivity in Radiation Grafted Proton Exchange Membranes

Analysis of the Wettability of Partially Fluorinated Polymers Reveals the Surprisingly Strong Acid-Base Character of Poly(vinylidene Fluoride)

Contact Info

Product

Resources

About