Block sulfonated poly(ether ether ketone)s (SPEEK) ionomers with high ion-exchange capacities for proton exchange membranes

Zhao, Chengji; Lin, Haidan; Shao, Kang; Li, Xianfeng; Ni, Hongzhe; Wang, Zhe; Na, Hui

doi:10.1016/j.jpowsour.2006.07.055

Cited by 88 publications

(35 citation statements)

References 30 publications

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“…It is clearly seen that the IECs determined by titration are less than the theoretical values. This result indicates that loss of sulfonated groups is occurring during purification procedures 24. As expected, the IEC values increase with an increase in sulfonated monomer content.…”

Section: Resultssupporting

confidence: 75%

Phosphorus‐Containing Sulfonated Polyimides for Proton Exchange Membranes

Çakır¹,

Karataş²,

Menceloǵlu³

et al. 2008

Macro Chemistry & Physics

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Synthesis and characterization of the novel sulfonated BAPPO monomer and its use in the synthesis of a new phosphine oxide‐based sulfonated polyimide are described. BTDA, 6FDA, and DDS were used as monomers in the polyimide synthesis. Sulfonated polyimide membranes were obtained by a solution thermal imidization method. The thermal behavior of the polymers was investigated by DSC and TGA. The morphological structure of the membranes was investigated by tapping‐mode AFM. The proton conductivities of the sulfonated polyimide increased regularly as a function of sulfonated diamine content. The conductivities are good compared to typical proton exchange membranes.magnified image

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Section: Resultssupporting

confidence: 75%

Phosphorus‐Containing Sulfonated Polyimides for Proton Exchange Membranes

Çakır¹,

Karataş²,

Menceloǵlu³

et al. 2008

Macro Chemistry & Physics

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“…7 shows a comparison of the FT-IR spectra of the hydrophilic and hydrophobic oligomers, and the characteristic peaks associated with sulfonation are observed for the hydrophilic one at 1241 cm À1 , 1071 cm À1 , 1035 cm À1 , and 700 cm À1 . The peaks at 1241 cm À1 and 1035 cm À1 arise from the symmetric and asymmetric O]S]O stretching, and the 1071 cm À1 and 700 cm À1 respectively from the SeO vibration and stretching [31]. Since those peaks are all attributed to the presence of sulfonic acid groups, the successful sulfonation of the hydrophilic oligomer was confirmed.…”

Section: Chemical Synthesis and Identificationmentioning

confidence: 82%

Comparison of proton conducting polymer electrolyte membranes prepared from multi-block and random copolymers based on poly(arylene ether ketone)

Kang

Kim

2015

Journal of Power Sources

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“…38 Although the multiblock copolymer structures produced by the segmented technique are less well-defined, this methodology has the great advantage of forming multiblock copolymers that can be synthesized more easily and in a shorter time, because there is no need to synthesize both oligomers separately and then couple them together. 37 To the best of our knowledge, the combination of the three aforementioned features for PEM materials, that is, (1) segmented copolymers, (2) with densely sulfonated hydrophilic blocks, and (3) pendent phenylsulfonic acid groups, has never been reported so far. Herein, we report the preparation of segmented copoly(ether sulfone)s with densely sulfonated pendent phenyl sulfonic acid groups.…”

Section: à18mentioning

confidence: 99%

Densely Sulfophenylated Segmented Copoly(arylene ether sulfone) Proton Exchange Membranes

Hwang

Lee

et al. 2011

Macromolecules

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Segmented copoly(arylene ether sulfone) membranes having densely sulfonated pendent phenyl blocks were synthesized by the coupling reaction of phenoxide-terminated oligomers with bis(4-hydroxyphenyl) sulfone and decafluorobiphenyl (DFBP), followed by postpolymerization sulfonation of the blocks containing pendent phenyl substituents. The coupling reaction was conducted at relatively low temperature by utilizing highly reactive DFBP to prevent any possible trans-etherification that would randomize the hydrophilic–hydrophobic sequences. Segmented copolymer molecular weights were reasonably high, as determined by viscosity measurements. Postsulfonation occurred selectively on the pendent phenyl substituent to yield hydrophilic blocks that were highly sulfonated in regular sequence on the linked phenyl rings. The resulting polymers gave transparent, flexible, and tough membranes by solution casting. Morphological observation by transmission electron microscopy (TEM) and atomic force microscopy (AFM) showed that the high local concentration and regular sequence of pendent sulfonic acid groups within the hydrophilic blocks enhanced nanophase separation between the hydrophobic and hydrophilic blocks. A comparison of copolymers with similar ion exchange capacities (IECs) indicated that proton conductivity and water uptake were strongly influenced by the hydrophilic block sequence lengths. Proton conductivity and water uptake increased with increasing block length, even at low relative humidity (RH). The ionomer membrane with X20Y20 (X and Y refer to the number of hydrophilic and hydrophobic repeat units, respectively) and 1.82 mequiv/g of IEC had a proton conductivity of 3.6 × 10–2 S/cm at 80 °C and 50% RH, which is comparable to that of perfluorinated ionomer (Nafion) membrane (4.0 × 10–2 S/cm).

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Block sulfonated poly(ether ether ketone)s (SPEEK) ionomers with high ion-exchange capacities for proton exchange membranes

Cited by 88 publications

References 30 publications

Phosphorus‐Containing Sulfonated Polyimides for Proton Exchange Membranes

Phosphorus‐Containing Sulfonated Polyimides for Proton Exchange Membranes

Comparison of proton conducting polymer electrolyte membranes prepared from multi-block and random copolymers based on poly(arylene ether ketone)

Densely Sulfophenylated Segmented Copoly(arylene ether sulfone) Proton Exchange Membranes

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