Polysulfone ionomers for proton-conducting fuel cell membranes: sulfoalkylated polysulfones

Karlsson, Lina

doi:10.1016/j.memsci.2003.10.033

Cited by 198 publications

(70 citation statements)

References 23 publications

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“…However, the high methanol permeability of these membranes limits their application in the DMFC field. [4][5][6] Because of this, extensive efforts have been made to develop alternative membrane materials, such as sulfonated polysulfone, 7 sulfonated poly(arylene ether sulfone) (SPAES), 8 sulfonated poly(aryl ether ketone), 9 and polybenzimidazole. 10 Of these polymers, SPAES has attracted considerable attention because of its high chemical and thermal stability and excellent mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Characterization of random and multiblock copolymers of highly sulfonated poly(arylene ether sulfone) for a proton‐exchange membrane

Cui

Maruyama

Ohmukai

et al. 2009

J of Applied Polymer Sci

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Random and multiblock copolymers of sulfonated poly(arylene ether sulfone) (SPAES) were synthesized and characterized to compare the differences in the properties of proton-exchange membranes made with random and multiblock SPAES copolymers. Atomic force microscopy observations and small-angle X-ray scattering measurements suggested the presence of nanoscale, clusterlike structures in the multiblock SPAES copolymers but not in the random SPAES copolymers. Proton-exchange membranes were prepared from random and multiblock copolymers with various ion-exchange capacities (IECs). The water uptake, proton conductivity, and methanol permeability of the SPAES membranes depended on the IECs of the random and multiblock SPAES copolymers. At the same IEC, the multiblock SPAES copolymers exhibited higher performances with respect to proton conductivity and proton/methanol permeation selectivity than the random SPAES copolymers. The higher performances of the multiblock SPAES copolymers were thought to be due to their clusterlike structure, which was similar to the ionic cluster of a Nafion membrane.

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Section: Introductionmentioning

confidence: 99%

Characterization of random and multiblock copolymers of highly sulfonated poly(arylene ether sulfone) for a proton‐exchange membrane

Cui

Maruyama

Ohmukai

et al. 2009

J of Applied Polymer Sci

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“…[4] Introduction of ionic pendant side chains [5] or ionic blocks [6] into these systems has shown promise in terms of materials performance, however the conductivity and membrane hydrodynamic properties typically remain lower relative to Nafion. Nafion, on the other hand, is a statistical copolymer comprising a perfluorinated hydrophobic backbone that contains a number of short, flexible pendant side chains with single hydrophilic sulfonic acid groups (Fig.…”

Section: Introductionmentioning

confidence: 99%

Highly Fluorinated Comb‐Shaped Copolymers as Proton Exchange Membranes (PEMs): Improving PEM Properties Through Rational Design

Norsten

Guiver

Murphy

et al. 2006

Adv Funct Materials

182

139

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A new class of comb‐shaped polymers for use as a proton conducting membrane is presented. The polymer is designed to combine the beneficial physical, chemical, and structural attributes of fluorinated Nafion‐like materials with higher‐temperature, polyaromatic‐based polymer backbones. The comb‐shaped polymer unites a rigid, polyaromatic, hydrophobic backbone with lengthy hydrophilic polymer side chains; this combination affords direct control over the polymer nanostructure within the membrane and results in distinct microphase separation between the opposing domains. The microphase separation serves to compartmentalize water into the hydrophilic polymer side chain domains, resulting in effective membrane water management and excellent proton conductivities.

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“…alkyl side-chains [39] or on short rigid aromatic sidechains [40], as seen in Figure 6. The former ionomers were prepared by first reacting lithiated PSU with sulfur dioxide to obtain sulfinated PSU.…”

Section: Ionically Crosslinked Sulfonated Poly(arylene Ether Sulfone)mentioning

confidence: 99%

“…The onset of decomposition of the membranes, cast from N,N-dimethylacetamide (DMAc) solutions in their lithium form, occurred just above 300 C, and the initial weight-loss corresponded to the weight of the sulfoalkyl side-chains [39]. The protonated membranes had slightly lower stabilities, and decomposed just below 300 C, as seen in Figure 7.…”

Section: Ionically Crosslinked Sulfonated Poly(arylene Ether Sulfone)mentioning

confidence: 99%

Fuel Cell Membrane Materials by Chemical Grafting of Aromatic Main‐Chain Polymers

Jannasch¹

2005

Fuel Cells

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An extensive world‐wide pursuit for new efficient fuel cell membranes materials is currently motivating research on proton‐conducting ionomers based on durable aromatic main‐chain polymers. In this context, most ionomers have been prepared either by direct sulfonation of polymers, using for example fuming sulfuric acid, or by direct polymerizations using different sulfonated monomers. Far less exploited are chemical grafting reactions carried out to introduce sulfonic acid units, or alternative acidic units, directly on the polymer main‐chain, or on side‐chains to the polymer main‐chain. This versatile method offers very interesting possibilities, not only to control the degree and the site of sulfonation, but also when it comes to manipulating the molecular mobility of the sulfonic acid units and their distance from the polymer main‐chain. The length and nature of the grafted units have shown to have a large influence on for example the water‐uptake characteristics and conductivity of ionomer membranes, especially at temperatures above 100 °C. Grafting can also be used to introduce other useful functions to the polymers, or to crosslink membranes. This paper reviews various grafting reactions carried out on aromatic main‐chain polymers, especially polybenzimidazoles and polysulfones, to prepare membrane materials, as well as the characteristics of these materials regarding their use in fuel cells.

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Polysulfone ionomers for proton-conducting fuel cell membranes: sulfoalkylated polysulfones

Cited by 198 publications

References 23 publications

Characterization of random and multiblock copolymers of highly sulfonated poly(arylene ether sulfone) for a proton‐exchange membrane

Characterization of random and multiblock copolymers of highly sulfonated poly(arylene ether sulfone) for a proton‐exchange membrane

Highly Fluorinated Comb‐Shaped Copolymers as Proton Exchange Membranes (PEMs): Improving PEM Properties Through Rational Design

Fuel Cell Membrane Materials by Chemical Grafting of Aromatic Main‐Chain Polymers

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