Synthesis and characterization of poly(arylene ether sulfone)-b-polybenzimidazole copolymers for high temperature low humidity proton exchange membrane fuel cells

Lee, Hae-Seung; Roy, Abhishek; Lane, Ozma; McGrath, James E.

doi:10.1016/j.polymer.2008.09.019

Cited by 86 publications

(69 citation statements)

References 30 publications

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“…The results presented here can at the present stage however not give an indication, whether comparable effects could be also true in the modified and acid-doped PBI membranes. However, the preliminary results show in accordance with earlier reports that comparable proton conductivities can be reached in nanostructured PBI at lower PA content [10].…”

Section: Conductivitysupporting

confidence: 92%

“…There are a few other attempts to achieve nanostructural control, which were reported recently, including (multi)block copolymer synthesis and generally, a positive effect on the conductivity was found but no detailed structural information (e.g. domain size) was provided so far [10][11][12]. Inspired by recent attempts to use graft copolymers to induce microphase-separated structures for organic-electronics applications [13], we aim to synthesize poly[2,2!-(m-phenylene)-5,5!bibenzimidazole] (PBI) based graft-copolymers that can undergo microphase separation.…”

Section: Introductionmentioning

confidence: 99%

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Nanostructured poly(benzimidazole) membranes by N-alkylation

Dominguez

Grygiel

Weber

2014

Express Polym. Lett.

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Abstract. Modification of poly(benzimidazole) (PBI) by N-alkylation leads to polymers capable of undergoing microphase separation. Polymers with different amounts of C 18 alkyl chains have been prepared. The polymers were analyzed by spectroscopy, thermal analysis, electron microscopy and X-ray scattering. The impact of the amount of alkyl chains on the observed microphase separation was analyzed. Membranes prepared from the polymers do show microphase separation, as evidenced by scattering experiments. While no clear morphology could be derived for the domains in the native state, evidence for the formation of lamellar morphologies upon doping with phosphoric acid is provided. Finally, the proton conductivity of alkyl-modified PBI is compared with that of pure PBI, showing that the introduction of alkyl side chains does not result in significant conductivity changes.

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Section: Conductivitysupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Nanostructured poly(benzimidazole) membranes by N-alkylation

Dominguez

Grygiel

Weber

2014

Express Polym. Lett.

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“…[32,33] The Grotthuss (proton hopping) mechanism and the vehicle mechanism, which are both well-known proton-conduction mechanisms between phosphoric acid and PBI, are also proposed as the protonconduction mechanism of LiHzS. [14,[43][44][45][46] The incorporation of the LiHzS into PBI may provide additional proton conduction pathways through its hydrogen-bonded structure. The increase in proton conductivity of PBI-LiHzS composite membranes was larger at higher temperatures.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Polybenzimidazole/Lithium Hydrazinium Sulfate Composite Membranes for High‐Temperature Fuel Cell Applications

Jung

Kim

Lee

2010

Macro Chemistry & Physics

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PBI‐LiHzS composite membranes were prepared by casting N,N'‐DMAc solutions containing PBI and LiHzS, where the LiHzS contents in the membranes were between 2.5 and 10 wt.‐%. LiHzS was obtained by reacting hydrazine sulfate and lithium carbonate in water. PBI‐LiHzS composite membranes were thermally stable up to approximately 300 °C and their acid‐absorbing capabilities were comparable to those of the pure PBI membranes. The proton conductivity of PBI‐LiHzS composite membranes (2.12 × 10−2 S · cm−1 at 180 °C and 0% RH) was higher than that of pure PBI membranes when used at the same acid doping levels. The mechanical stability of the composite membranes having less than 5 wt.‐% of LiHzS was found to be close to that of pure PBI membranes.magnified image

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“…Generally, there has been some success in the synthesis of block copolymers using rigid, highperformance polymers (e.g., poly(aramide)s, poly(thiophene)s), [51,52] but up to now, only little work has been spent on the synthesis of PBI block copolymers. [25,53,54] Nanostructured PBI is an exciting new field, which has the potential to be explored and exploited. Furthermore, there is also room for improvement for the synthesis of PBI.…”

Section: Discussionmentioning

confidence: 99%

Nanostructured Poly(benzimidazole): From Mesoporous Networks to Nanofibers

Weber

2010

ChemSusChem

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Poly(benzimidazole)s (PBIs) are a class of high-performance polymers which have been receiving increasing interest during the last years due to their high potential as constituents of membrane materials in proton-exchange membrane fuel cells (PEMFCs). In addition to the importance of PBI in fuel-cell technology, there are a number of other applications (e.g., catalysis) that make use of the special properties of this material. The scope of this Minireview is to first give a short overview about the use of nanostructured, mesoporous PBI as a proton conductor. Secondly, the use of spirobifluorene derivatives as new monomers, which allow the synthesis of hierarchically structured PBI, is presented. Limitations of traditional synthetic methods will be discussed, and an ionothermal scheme towards PBI will be presented as a versatile tool for the synthesis of plain and spirobifluorene-based PBIs. Finally, the use of electrospinning as a powerful processing technique for PBI will be presented briefly.

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Synthesis and characterization of poly(arylene ether sulfone)-b-polybenzimidazole copolymers for high temperature low humidity proton exchange membrane fuel cells

Cited by 86 publications

References 30 publications

Nanostructured poly(benzimidazole) membranes by N-alkylation

Nanostructured poly(benzimidazole) membranes by N-alkylation

Preparation of Polybenzimidazole/Lithium Hydrazinium Sulfate Composite Membranes for High‐Temperature Fuel Cell Applications

Nanostructured Poly(benzimidazole): From Mesoporous Networks to Nanofibers

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