Proton Conductivity and Vapor Permeation Properties of Polyimides Containing Sulfonic Acid Groups

Watari, Tatsuya; Fang, Jianhua; Guo, Xin; Tanaka, Kazuhiro; Kita, Hidetoshi; Okamoto, Ken‐ichi

doi:10.1021/bk-2004-0876.ch017

Cited by 11 publications

(17 citation statements)

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“…The weight loss starting from 250-350 C is attributed to the decomposition of the sulfonic acid groups judging from the evolution of sulfur monoxide and sulfur dioxide. 26,33 The BAPBDS-based SPIs generally displayed decomposition temperature of sulfonic acid groups around 300 C. In the case of 2,2 0 -or 3,3 0 -BSPB-based SPIs, the evolution of propane and propylene were also observed around 250 C, indicating the decomposition of sulfopropoxy side groups. The decomposition temperatures of BSPB-based SPIs were in the range of 232 to 256 C, which was lower than those of the BAPBDS-based SPIs, indicating lower thermal stability of the sulfopropoxy groups.…”

Section: Thermal Properties Of Spi Membranesmentioning

confidence: 98%

“…[23][24][25][26][27][28] We classified the sulfonated diamines into two groups. The sulfonated diamines such as BDSA, 4,4 0 -diamino-diphenyl-ether-2,2 0 -disulfonic acid (ODADS) and 4,4 0 -bis(4-amino-2-sulfophenoxy)biphenyl (iBAPBDS), where the electron-withdrawing sulfonic acid groups are bonded directly to the amino-phenyl rings, are noted as ''Type 1''.…”

Section: Water Stability Of Spi Membranes Developed So Far (I)mentioning

confidence: 99%

“…The water stability was evaluated by the elapsed time until the membrane hydrated in water lost the mechanical property. The loss of mechanical property was judged when the membrane broke after being lightly bent in the case of the soaking at 80 C or when the membrane began to break into pieces under boiling in the case of soaking at 100 C. 26 The data are summarized in Table I.…”

Section: Water Stability Of Spi Membranes Developed So Far (I)mentioning

confidence: 99%

See 2 more Smart Citations

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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Section: Thermal Properties Of Spi Membranesmentioning

confidence: 98%

Section: Water Stability Of Spi Membranes Developed So Far (I)mentioning

confidence: 99%

Section: Water Stability Of Spi Membranes Developed So Far (I)mentioning

confidence: 99%

See 1 more Smart Citation

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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show abstract

“…As shown in Table 5, all SPI membranes showed excellent oxidative stability due to the wholly aromatic sulfonated diamine. The time of the membranes started to dissolve (>33 h) larger than that of those copolyimides based on NTDA and 4,4 -diaminodiphenylether-2,2 -disulfonic acid (ODADS) [18], 9,9-bis(4-aminophenyl)fluorene-2,7-disulfonic acid (BAPFDS) [24] and 4,4 -bis(4-aminophenoxy)biphenyl-3,3 -disulfonic acid (BAPBDS) [31] which all are lower than 30 h. Although the SPI(I)-x membranes contain an ether bond, they show better oxidative stability than that of NTDA/2,2 -BSBB(70) [26]. The results indicated that the hydrolytic stability of sulfonated polyimides have an effect on the oxidative stability.…”

Section: Membrane Stability Toward Water and Oxidationmentioning

confidence: 99%

Preparation and evaluation of a proton exchange membrane based on oxidation and water stable sulfonated polyimides

Cui

Zhang

et al. 2007

Journal of Power Sources

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“…Relationship (62) provides the means to estimate the contribution from separate polar groups and spe cific intermolecular interactions to surface tension. For example, it is usually of interest to determine the contribution from hydrogen bonding to the surface tension of organic liquids.…”

Section: Surface Tensionmentioning

confidence: 99%

Methods for calculating the physical properties of polymers

Аскадский

2015

Ref. J. Chem.

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The approaches that derive the best predictions of physical properties of polymers from the chemical structure of their repeating unit are the van Krevelen, Bicerano, and Askadskii-Matveev. The potential of these three approaches is analyzed. All of the approaches are computerized and allow online predictions to be made. The PDTools and SYNTHIA programs are briefly overviewed, and the Cascade software (developed at the Nesmeyanov Institute of Organoelement Compounds) is described in detail. All of the approaches and the corresponding computer programs make it possible to estimate over 120 physical properties of polymers, including their volumetric, thermal, mechanical, thermophysical, optical, dielectric, and barrier properties. Particular attention is focused on the solu bility and miscibility of polymers and on the properties of copolymers, polymer blends, and nanocom posites. The Cascade software provides the means to carry out computer syntheses of polymers with preset properties, the intervals of which are input by the user, and to calculate the dependences of these properties on temperature, plasticizer and nanoparticle concentrations, and nanoparticle size and shape.

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Proton Conductivity and Vapor Permeation Properties of Polyimides Containing Sulfonic Acid Groups

Cited by 11 publications

References 0 publications

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

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

Preparation and evaluation of a proton exchange membrane based on oxidation and water stable sulfonated polyimides

Methods for calculating the physical properties of polymers

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