Synthesis, proton conductivity and methanol permeability of a novel sulfonated polyimide from 3-(2′,4′-diaminophenoxy)propane sulfonic acid

Yin, Yan; Fang, Jianhua; Cui, Yongfang; Tanaka, Kazuhiro; Kita, Hidetoshi; Okamoto, Ken‐ichi

doi:10.1016/s0032-3861(03)00439-7

Cited by 151 publications

(86 citation statements)

References 28 publications

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“…The Okamoto group also attempted to impart intrinsic hydrolytic stability to SPIs by incorporating various types of monomers [26]. In particular, SPIs with sulfonic acid groups on the side chains (grafted sulfonic acid groups) exhibited a significant improvement in their hydrolytic stability due to the higher basicity of the diamine moieties and their microphase-separated structure [96,97]. Using a similar concept, Asano et al synthesized highly stable sulfonated copolyimides with aliphatic groups in both the main chains and the side chains.…”

Section: Direct Copolymerization Of Sulfonated Monomersmentioning

confidence: 99%

Sulfonated hydrocarbon membranes for medium-temperature and low-humidity proton exchange membrane fuel cells (PEMFCs)

Park

Lee

Guiver

2011

Progress in Polymer Science

611

229

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Section: Direct Copolymerization Of Sulfonated Monomersmentioning

confidence: 99%

Sulfonated hydrocarbon membranes for medium-temperature and low-humidity proton exchange membrane fuel cells (PEMFCs)

Park

Lee

Guiver

2011

Progress in Polymer Science

611

229

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“…The first one consists in replacing Nafion® by alternative polymers, such as sulfonated polyetherketone [1,2], sulfonated polysulfone [3][4][5], sulfonated aromatic polyimide [6,7] and polybenzimidazole (PBI) doped by a strong acid, e.g., H 3 PO 4 and H 2 SO 4 [8][9][10]. PBI membranes are remarkable because they do not need to be humidified for exhibiting high ionic conductivity, which allows for operation at temperature higher than 100°C.…”

Section: Introductionmentioning

confidence: 99%

Beneficial effect of carbon nanotubes on the performances of Nafion membranes in fuel cell applications

Thomassin

Kollár

Caldarella

et al. 2007

Journal of Membrane Science

135

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Multi-walled carbon nanotubes (MWCNTs) were dispersed by melt-extrusion within Nafion® membranes in order to decrease the methanol permeability without deleterious effect on the ionic conductivity. The risk of short-circuits was minimized by keeping the carbon nanotubes content lower than the percolation threshold. Two series of carbon nanotubes grafted by carboxylic acid groups were used, i.e., commercially available carbon nanotubes and MWCNTs home-grafted by carboxylic acid containing alkyl radicals. The second series of nanotubes were more resistant to break-up during melt-processing. Methanol permeability was decreased by approximately 60% without any decrease in the ionic conductivity. In parallel, the Young's modulus was increased by 140% and 160% as compared to pure Nafion® at MWCNT contents of 1 and 2 wt%, respectively.

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“…We also synthesized side-chain-type SPIs bearing pendant sulfoalkoxy groups, such as 2,2 0 -bis(3-sulfopropoxy)benzidine (2,2 0 -BSPB) and 3,3 0 -bis(3-sulfo-propoxy)benzidine (3,3 0 -BSPB), of which the chemical structures are also shown in Figure 1, and investigated the water stability of their membranes. [32][33][34] The data are also summarized in Table I. The side-chaintype SPIs based on 2,2 0 -BSPB and 3,3 0 -BSPB displayed much better water stability than the mainchain-type SPIs.…”

mentioning

confidence: 96%

On the Development of Naphthalene-Based Sulfonated Polyimide Membranes for Fuel Cell Applications

Yin

Yamada

Tanaka

et al. 2006

Polym J

Self Cite

176

109

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ABSTRACT:This article reviews the recent progress made over the past years based on naphthalene-based sulfonated polyimides (SPIs) in terms of proton conductivity, membrane swelling behavior, membrane stability toward water, and fuel cell performance in polymer electrolyte fuel cells (PEFCs) or direct methanol fuel cells (DMFCs). The structure-property relationship of SPI membranes is discussed in details with respect to the chemical structure of various sulfonated diamines and morphology of SPI membranes from the viewpoints of viscosity, mechanical strength and proton conductivity. Ion exchange capacity (IEC), basicity of sulfonated diamine, configuration (para-, meta-, or ortho-orientation) and chemical structure of polymer chain (linear or net-work) show great influence on the water stability and mechanical strength of SPI membrane. The SPIs with a branched/crosslinked structure and derived from highly basic sulfonated diamines display reasonably high water stability of more than 200-300 h in water at 130 C, suggesting high potential as PEMs operating at temperatures up to 100 C. The SPI membranes have fairly high proton conductivity at higher relative humidities and low methanol permeability. The water and methanol crossover through membrane under the fuel cell operation conditions is not controlled by electro-osmosis due to proton transport but by diffusion due to activity difference. This is quite different from the case of perfluorosulfonated membranes such as Nafion and results in the advantageous effects on fuel cell performance. SPI membranes displayed high PEFC performances comparable to those of Nafion 112. In addition, SPI membranes displayed higher performances in DMFC systems with higher methanol concentration (20-50 wt %), which is superior to Nafion and have high potential for DMFC applications at mediate temperatures (40-80 C In the past decades, great interest has been focused on the development of polymer electrolyte fuel cells (PEFCs) and direct methanol fuel cells (DMFCs) as a clean power source of energy for transportation, stationary and portable power applications.1,2 Fuel cells with high performance, high durability and potentially lower cost are greatly required. Polymer electrolyte membrane (PEM) is one of the key components in PEFC and DMFC systems. Perfluorosulfonic acid copolymer membranes, such as DuPont's Nafion membrane, are the state-of-the-art PEMs commercially available due to their high proton conductivity and excellent chemical stability.3,4 However, because of their high cost, low operational temperature below 80 C and large methanol crossover, there has been much interest in alternative PEMs. Many efforts have been done in the development of PEMs based on sulfonated aromatic hydrocarbon polymers. [5][6][7][8][9] The main problem existed in the hydrocarbon PEMs is the membrane stability under fuel cell conditions and low conducting performance at low moisture atmosphere. The balance between ion exchange capacity (IEC), proton conductivity and mechanical stability of a PEM ...

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Synthesis, proton conductivity and methanol permeability of a novel sulfonated polyimide from 3-(2′,4′-diaminophenoxy)propane sulfonic acid

Cited by 151 publications

References 28 publications

Sulfonated hydrocarbon membranes for medium-temperature and low-humidity proton exchange membrane fuel cells (PEMFCs)

Sulfonated hydrocarbon membranes for medium-temperature and low-humidity proton exchange membrane fuel cells (PEMFCs)

Beneficial effect of carbon nanotubes on the performances of Nafion membranes in fuel cell applications

On the Development of Naphthalene-Based Sulfonated Polyimide Membranes for Fuel Cell Applications

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