% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@ARTICLE{Conti:21243,
      author       = {Conti, F. and Majerus, A. and Di Noto, V. and Korte, C. and
                      Lehnert, W. and Stolten, D.},
      title        = {{R}aman study of the polybenzimidazole - phosphoric acid
                      interactions in membranes for fuel cells},
      journal      = {Physical Chemistry Chemical Physics},
      volume       = {14},
      issn         = {1463-9076},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {PreJuSER-21243},
      pages        = {10022 - 10026},
      year         = {2012},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {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.},
      keywords     = {Benzimidazoles: chemistry / Electric Power Supplies /
                      Membranes, Artificial / Phosphoric Acids: chemistry /
                      Polymers: chemistry / Spectrum Analysis, Raman /
                      Benzimidazoles (NLM Chemicals) / Membranes, Artificial (NLM
                      Chemicals) / Phosphoric Acids (NLM Chemicals) / Polymers
                      (NLM Chemicals) / poly(benzimidazole) (NLM Chemicals) /
                      phosphoric acid (NLM Chemicals) / J (WoSType)},
      cin          = {IEK-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IEK-3-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      shelfmark    = {Chemistry, Physical / Physics, Atomic, Molecular $\&$
                      Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22699788},
      UT           = {WOS:000305890300025},
      doi          = {10.1039/c2cp40553a},
      url          = {https://juser.fz-juelich.de/record/21243},
}