Highly sulfonated poly(aryl ether ketone) block coplymers having a cross-linking structure

Ishikawa, Junichi; Fujiyama, Satoko; Inoue, Koji; Omi, Takehiko; Tamai, Shoji

doi:10.1016/j.memsci.2007.03.057

Cited by 32 publications

(23 citation statements)

References 18 publications

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“…A variety of alternative PEMs have been developed in the last decades for high temperature PEMFCs and DMFCs [8]: such as chemically and physically cross-linked membranes [9][10][11][12][13], organic-inorganic hybrid materials [14][15][16][17], and acid-base blend membranes [18][19][20][21][22]. As one of the most promising candidates, acid-base blend membranes consisting of an acidic polymer and a basic compound containing N-heterocycle groups have attracted much attention and there are many acid-base blend membranes fabricated during the past decade.…”

Section: Figure 1 Operating Principles Of a Proton Exchange Membranementioning

confidence: 99%

Novel Blend Membranes Based on Acid-Base Interactions for Fuel Cells

2012

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Fuel cells hold great promise for wide applications in portable, residential, and large-scale power supplies. For low temperature fuel cells, such as the proton exchange membrane fuel cells (PEMFCs) and direct methanol fuel cells (DMFCs), proton-exchange membranes (PEMs) are a key component determining the fuel cells performance. PEMs with high proton conductivity under anhydrous conditions can allow PEMFCs to be operated above 100 °C, enabling use of hydrogen fuels with high-CO contents and improving the electrocatalytic activity. PEMs with high proton conductivity and low methanol crossover are critical for lowering catalyst loadings at the cathode and improving the performance and long-term stability of DMFCs. This review provides a summary of a number of novel acid-base blend membranes consisting of an acidic polymer and a basic compound containing N-heterocycle groups, which are promising for PEMFCs and DMFCs.

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Section: Figure 1 Operating Principles Of a Proton Exchange Membranementioning

confidence: 99%

Novel Blend Membranes Based on Acid-Base Interactions for Fuel Cells

2012

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“…1 Proton-exchange membranes (PEMs), which are sandwiched between the anodes and cathodes of cells, play an important role in the development of DMFCs. 2 The qualities needed for highperformance PEMs include high proton conductivity, low fuel permeability, and good thermal and mechanical stability. 3 Hydrated perfluorosulfonic acid membranes such as Nafion are well-known materials for PEMs.…”

Section: Introductionmentioning

confidence: 99%

“…random SPEEK. Ishikawa et al 2 synthesized multiblock copolymers of sulfonated poly(aryl ether ketone)s and reported that a multiblock copolymer showed higher proton/methanol selectivity than a random copolymer. Roy et al 13 studied the influence of the chemical composition and sequence length on the transport properties of PEMs and observed that under partially hydrated conditions, block copolymers showed greater proton conductivity than random copolymers.…”

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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“…These aromatic random block copolymers are commercially available materials, well known for their excellent mechanical, lower cost, thermal and chemical properties [20,2]. Aromatic random block copolymer ionomers containing sulfonated polystyrene groups have been prepared and used for PEMs, including sulfonated poly(styrene-b-[ethylene-co-butylene]-b-styrene) [21], sulfonated polyaryl ether ketone block copolymer [22], fluorinated polyisoprene-block-sulfonated polystyrene [23], poly(ether ether ketone)-block-sulfonated polybutadiene copolymer [24], sulfonated multiblock copolynaphthalinides [25] and sulfonated pentablock copolymer [26]. Moreover, the aromatic random block copolymerinorganic composite membranes based on SiO 2 [27][28][29], TiO 2 [30,31], ZrO 2 [32,33], heteropolyacid [34], clay [35] and carbon nanotube [36] for proton exchange membranes (PEMs) have been extensively investigated.…”

Section: Introductionmentioning

confidence: 99%