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001     21243
005     20240711101513.0
024 7 _ |a pmid:22699788
|2 pmid
024 7 _ |a 10.1039/C2CP40553A
|2 DOI
024 7 _ |a WOS:000305890300025
|2 WOS
024 7 _ |a 1463-9076
|2 ISSN
024 7 _ |a 2128/7472
|2 Handle
037 _ _ |a PreJuSER-21243
041 _ _ |a eng
082 _ _ |a 540
084 _ _ |2 WoS
|a Chemistry, Physical
084 _ _ |2 WoS
|a Physics, Atomic, Molecular & Chemical
100 1 _ |a Conti, F.
|b 0
|u FZJ
|0 P:(DE-Juel1)VDB106052
245 _ _ |a Raman study of the polybenzimidazole - phosphoric acid interactions in membranes for fuel cells
260 _ _ |c 2012
|a Cambridge
|b RSC Publ.
300 _ _ |a 10022 - 10026
336 7 _ |a Journal Article
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336 7 _ |a JOURNAL_ARTICLE
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336 7 _ |a article
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440 _ 0 |a Physical Chemistry Chemical Physics
|0 25363
|y 28
|v 14
500 _ _ |a Record converted from VDB: 12.11.2012
520 _ _ |a Poly(2,5-benzimidazole) (AB-PBI) membranes are investigated by studying the FT-Raman signals due to the benzimidazole ring vibration together with the C-C and C-H out-of- and in-plane ring deformations. By immersion in aqueous ortho-phosphoric acid for different time periods, membranes with various doping degrees, i.e. different molar fractions of acid, are prepared. The chemical-physical interactions between polymer and acid are studied through band shifting and intensity change of diagnostic peaks in the 500-2000 cm(-1) spectral range. The formation of hydrogen bonding networks surrounding the polymer seems to be the main reason for the observed interactions. Only if the AB-PBI polymer is highly doped, the Raman spectra show an additional signal, which can be attributed to the presence of free phosphoric acid molecules in the polymer network. For low and intermediate doping degrees no evidence for free phosphoric acid molecules can be seen in the spectra. The extent of the polymer-phosphoric acid interactions in the doped membrane material is reinvestigated after a period of one month and the stability discussed. Our results provide insight into the role of phosphoric acid as a medium in the conductivity mechanism in polybenzimidazole.
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588 _ _ |a Dataset connected to Web of Science, Pubmed
650 _ 2 |2 MeSH
|a Benzimidazoles: chemistry
650 _ 2 |2 MeSH
|a Electric Power Supplies
650 _ 2 |2 MeSH
|a Membranes, Artificial
650 _ 2 |2 MeSH
|a Phosphoric Acids: chemistry
650 _ 2 |2 MeSH
|a Polymers: chemistry
650 _ 2 |2 MeSH
|a Spectrum Analysis, Raman
650 _ 7 |0 0
|2 NLM Chemicals
|a Benzimidazoles
650 _ 7 |0 0
|2 NLM Chemicals
|a Membranes, Artificial
650 _ 7 |0 0
|2 NLM Chemicals
|a Phosphoric Acids
650 _ 7 |0 0
|2 NLM Chemicals
|a Polymers
650 _ 7 |0 0
|2 NLM Chemicals
|a poly(benzimidazole)
650 _ 7 |0 7664-38-2
|2 NLM Chemicals
|a phosphoric acid
650 _ 7 |a J
|2 WoSType
700 1 _ |a Majerus, A.
|b 1
|u FZJ
|0 P:(DE-Juel1)VDB106160
700 1 _ |a Di Noto, V.
|b 2
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700 1 _ |a Korte, C.
|b 3
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700 1 _ |a Lehnert, W.
|b 4
|u FZJ
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700 1 _ |a Stolten, D.
|b 5
|u FZJ
|0 P:(DE-Juel1)129928
773 _ _ |0 PERI:(DE-600)1476244-4
|a 10.1039/c2cp40553a
|g Vol. 14, p. 10022 - 10026
|p 10022 - 10026
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|t Physical Chemistry Chemical Physics
|v 14
|x 1463-9076
|y 2012
856 7 _ |u http://dx.doi.org/10.1039/C2CP40553A
856 4 _ |u https://juser.fz-juelich.de/record/21243/files/FZJ-21243.pdf
|y Published under German "Allianz" Licensing conditions on 2012-05-08. Available in OpenAccess from 2013-05-08
|z Published final document.
856 4 _ |u https://juser.fz-juelich.de/record/21243/files/FZJ-21243_PV.pdf
|z Published final document.
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