Sulfonated multiblock copolynaphthalimides for polymer electrolyte fuel cell application

Chen, Kangcheng; Hu, Zhaoxia; Endo, Nobutaka; Higa, Mitsuru; Okamoto, Ken‐ichi

doi:10.1016/j.polymer.2011.03.034

Cited by 34 publications

(40 citation statements)

References 46 publications

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“…They attributed the difference in proton conductivity to the morphology differences, where side chain-grafted sulfonic acid groups showed better nanoscale phase separation. [91] 1-18 [93] Scheme 12 Structures of fluorinated block SPIs.…”

Section: Sulfonated Fluorinated Poly(ether Imide)smentioning

confidence: 99%

“…These authors were of the opinion that, at higher block lengths, the length of the inter-domain connections increased, leading to a decrease in proton conductivity. Recently, Chen et al (93) prepared multiblock SPIs (Scheme 12, 1-18) and observed that the increase in block lengths (hydrophilic/hydrophobic ratio of 20:10 and 20:20) showed higher in-plane and through-plane proton conductivity even at a lower IEC value of 1.35 mequiv/g. The through-plane proton conductivity for the longer block length was recorded to be 29 mS/cm compared to a value of only 11 mS/cm for the smaller block length at 59°C and 27% RH, which the authors attributed to the more effective back diffusion for water at longer block length.…”

Section: Sulfonated Fluorinated Block Copolyimidesmentioning

confidence: 99%

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Sulfonated fluorinated-aromatic polymers as proton exchange membranes

Ghosh¹,

Banerjee

2014

E-Polymers

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Abstract:In recent years, extensive research on the preparation and properties of proton exchange membranes (PEMs) has been realized. This article focusses on the recent studies on new PEM materials based on aromatic hydrocarbon polymers with sulfonated groups as hydrophilic domains and fluorinated groups as hydrophobic domains as alternatives to conventional perfluorinated polymers. It is necessary to improve the proton conductivity especially under low-humidity conditions and at high operating temperatures to break through the current aromatic PEM system. Hence, there is a need to develop new high-conductivity fuel cell ionomers with improved thermal, chemical, and electrochemical stability by designing a suitable polymer structure for PEM application.

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Section: Sulfonated Fluorinated Poly(ether Imide)smentioning

confidence: 99%

Section: Sulfonated Fluorinated Block Copolyimidesmentioning

confidence: 99%

Sulfonated fluorinated-aromatic polymers as proton exchange membranes

Ghosh¹,

Banerjee

2014

E-Polymers

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“…The observed broad band at 1248 and 1195 cm ¹1 corresponding to the asymmetric and symmetric vibration of O=S=O in the sulfonic acid groups. 27,28 The polymer orientation in SPI thin film has been distinguished according to the changes in the intensity of p-MAIR spectra. In principle, the maximum intensity of the p-MAIR signal arise when the electric field vector of IR rays and the orientation of the molecular vibration are parallel.…”

Section: S CMmentioning

confidence: 99%

“…) is found in the C=O asymmetric mode 27,28 of OP component relative to that of the IP component (1676 cm…”

Section: ¹1mentioning

confidence: 99%

“…Owing to the random orientation of the bulk SPI, consideration of the intensity of vibration mode is insignificant for investigation. It is also essential to mention that the frequency downshift is observed for both the asymmetric C=O (1711 cm ¹1 ) 27 and symmetric C=O (1666 cm ¹1 ) stretching vibrations of bulk SPI than that of the stretching modes in oriented film.…”

Section: ¹1mentioning

confidence: 99%

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Influence of Confined Polymer Structure on Proton Transport Property in Sulfonated Polyimide Thin Films

et al. 2014

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The organized structure and proton transport property in sulfonated polyimide (SPI) thin film have been studied, much less is known at the interfacial charge transport during confinement of such materials. The proton conductivity of SPI thin film is correlated well with the highly oriented polymer structures as determined by infrared (IR) p-polarized multiple-angle incidence resolution spectrometry (p-MAIRS) and in situ RH dependent synchrotron grazing incidence X-ray diffraction (GI-XRD). The high proton conductivity of 2.8 × 10−1 S cm −1 at 80°C and 90% RH was achieved in the highly oriented SPI thin film. In contrast, the bulk SPI showed the drop of conductivity value at high relative humidity region, which is due to the significant structural disorder accompanied by the strong interaction between the sulfonic acid side chains and water molecules.

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Synthesis and characterization of sulfonated block copolyimides derived from 4,4'‐sulfide‐bis(naphthalic anhydride) for proton exchange membranes

Chen

Pei

Wei

et al. 2014

J of Applied Polymer Sci

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A series of sulfonated copolyimides (SPIs) with hydrophilic segment length of 20-60 based on 4,4 0 -sulfide-bis(naphthalic anhydride) (SBNA) have been successfully synthesized to improve hydrolytic stability and proton conductivity. The SPI membranes were cast from their m-cresol solutions, and they were characterized by determining the water uptake, water swelling ratio, mechanical properties, hydrolytic stability, oxidative stability, and proton conductivity. It was found that the water uptake of SPI membranes was low and decreased as the hydrophilic segment length increased, which led to good dimensional stability. In addition, the SPI membranes with low ion-exchange capacity (IEC) value displayed excellent hydrolytic stability and retained good mechanical properties even after harsh hydrolysis testing, in which the block SPI with hydrophilic segment length of 40 had the best hydrolytic stability, while those with high IEC value showed an apparent decrease. All of the block SPI membranes show better conductivity than the random ones at the temperature range from 30 to 70 C. Interestingly, the proton conductivities of random SPI membranes were higher than that of corresponding block ones at 90 C. The block SPI with hydrophilic segment length of 40 gave the highest proton conductivity as the temperature increased among the block SPIs.

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Sulfonated multiblock copolynaphthalimides for polymer electrolyte fuel cell application

Cited by 34 publications

References 46 publications

Sulfonated fluorinated-aromatic polymers as proton exchange membranes

Sulfonated fluorinated-aromatic polymers as proton exchange membranes

Influence of Confined Polymer Structure on Proton Transport Property in Sulfonated Polyimide Thin Films

Synthesis and characterization of sulfonated block copolyimides derived from 4,4'‐sulfide‐bis(naphthalic anhydride) for proton exchange membranes

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