Partially fluorinated proton exchange membranes based on PVDF–SEBS blends compatibilized with methylmethacrylate block copolymers

Mokrini, Asmae; Huneault, Michel A.; Gérard, Pierre

doi:10.1016/j.memsci.2006.06.032

Cited by 45 publications

(30 citation statements)

References 23 publications

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“…Introducing a third component in blended membranes was found to be an effective method for enhancing the interface between two poor compatibility phases. Proton conductivities, methanol permeabilities and mechanical properties were all improved by the addition of an appropriate third component such as PNVP [78] or block copolymer [101][102][103][104].…”

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confidence: 99%

Water Soluble Polymers as Proton Exchange Membranes for Fuel Cells

2012

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Abstract:The relentless increase in the demand for useable power from energy-hungry economies continues to drive energy-material related research. Fuel cells, as a future potential power source that provide clean-at-the-point-of-use power offer many advantages such as high efficiency, high energy density, quiet operation, and environmental friendliness. Critical to the operation of the fuel cell is the proton exchange membrane (polymer electrolyte membrane) responsible for internal proton transport from the anode to the cathode. PEMs have the following requirements: high protonic conductivity, low electronic conductivity, impermeability to fuel gas or liquid, good mechanical toughness in both the dry and hydrated states, and high oxidative and hydrolytic stability in the actual fuel cell environment. Water soluble polymers represent an immensely diverse class of polymers. In this comprehensive review the initial focus is on those members of this group that have attracted publication interest, principally: chitosan, poly (ethylene glycol), poly (vinyl alcohol), poly (vinylpyrrolidone), poly (2-acrylamido-2-methyl-1-propanesulfonic acid) and poly (styrene sulfonic acid). The paper then considers in detail the relationship of structure to functionality in the context of polymer blends and polymer based networks together with the effects of membrane crosslinking on IPN and semi IPN architectures. This is followed by a review of pore-filling and other impregnation approaches. Throughout the paper detailed numerical results are given for comparison to today's state-of-the-art Nafion ® based materials.

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confidence: 99%

Water Soluble Polymers as Proton Exchange Membranes for Fuel Cells

2012

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“…They were then immersed in water at room temperature and, after 24 hours, the swollen samples were removed from the water, slightly wiped up with a dry cloth and immediately weighted (w wet ). Swelling was evaluated using ( ) ϕ = − ×100 w wet dry dry w w w [12][13][14] . Morphology of the blends was investigated using a JSM 6060 (Jeol) scanning electron microscope (SEM) operating at 10 keV.…”

Section: Methodsmentioning

confidence: 99%

Sulfonation and characterization of styrene-indene copolymers for the development of proton conducting polymer membranes

et al. 2012

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Abstract:The aim of this work is to obtain polymer precursors based on styrene copolymers with distinct degrees of sulfonation, as an alternative material for fuel cell membranes. Acetyl sulfate was used to carry out the sulfonation and the performance of the polyelectrolyte was evaluated based on the content of acid polar groups incorporated into the macromolecular chain. Polymeric films were produced by blending the sulfonated styrene-indene copolymer with poly(vinylidene fluoride). The degree of sulfonation of the polymer was strongly affected by the sulfonation reaction parameters, with a direct impact on the ionic exchange capacity and the ionic conductivity of the sulfonated polymers and the membranes obtained from them. The films produced with the blends showed more suitable mechanical properties, although the conductivity of the membranes was still lower than that of commercially available membranes used in fuel cells.

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“…Carefully selected blend morphologies could improve methanol fuel cell performance by restricting, for example, the swelling of the hydrophilic blend component in such a way that the benefit in methanol crossover reduction is far greater than the drawback related to proton conductivity reduction. Recent investigations on the fabrication of polymer blend membranes produced using meltprocessing technologies have shown the potential of this approach [24][25][26]. The use of melt-processable polymers provides a significant cost-reduction compared to conventional PEM fabrication technologies and simplifies the scale-up toward mass production.…”

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confidence: 99%

“…Subsequently, they were dried to weight constancy under vacuum at room temperature and again weighed. The water content is calculated from the weight difference of the membrane in its hydrated and dry state [25], according to the following equation:…”

Section: Equilibrium Water Contentmentioning

confidence: 99%

“…A Nafion112 ® sample was measured as a reference before each series of measurements. As commonly accepted, the resistivity of the membrane was evaluated from the high frequency part of the Nyquist plot that coincides with the bulk resistance of the polymer [25]. Ionic conductivity of the samples were calculated using the following equation:…”

Section: Proton Conductivitymentioning

confidence: 99%

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Non-fluorinated proton-exchange membranes based on melt extruded SEBS/HDPE blends

Mokrini

Huneault

Shi

et al. 2008

Journal of Membrane Science

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This paper reports on functional polymer blends prepared by melt-processing technologies for proton-exchange membrane applications. Styrene-ethylene/butylene-styrene (SEBS) and high-density polyethylene (HDPE) were melt blended using twin-screw compounding, extruded into thin films by extrusion-calendering. The films were then grafted with sulfonic acid moieties to obtain ionic conductivity leading to proton-exchange membranes. The effect of blend composition and sulfonation time was investigated. The samples were characterized in terms of morphology, microstructure, thermo-mechanical properties and in terms of their conductivity, ion exchange capacity (IEC) and water uptake in an effort to relate the blend microstructure to the membrane properties. The HDPE was found to be present in the form of elongated structures which created an anisotropic structure especially at lower concentrations. The HDPE increased the membrane mechanical properties and restricted swelling, water uptake and methanol crossover. Room temperature through-plane conductivities of the investigated membranes were up to 4.5E−02Scm −1 at 100% relative humidity, with an ionic exchange capacity of 1.63 meq g −1 .Crown

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Partially fluorinated proton exchange membranes based on PVDF–SEBS blends compatibilized with methylmethacrylate block copolymers

Cited by 45 publications

References 23 publications

Water Soluble Polymers as Proton Exchange Membranes for Fuel Cells

Water Soluble Polymers as Proton Exchange Membranes for Fuel Cells

Sulfonation and characterization of styrene-indene copolymers for the development of proton conducting polymer membranes

Non-fluorinated proton-exchange membranes based on melt extruded SEBS/HDPE blends

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