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000021243 084__ $$2WoS$$aChemistry, Physical
000021243 084__ $$2WoS$$aPhysics, Atomic, Molecular & Chemical
000021243 1001_ $$0P:(DE-Juel1)VDB106052$$aConti, F.$$b0$$uFZJ
000021243 245__ $$aRaman study of the polybenzimidazole - phosphoric acid interactions in membranes for fuel cells
000021243 260__ $$aCambridge$$bRSC Publ.$$c2012
000021243 300__ $$a10022 -  10026
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000021243 440_0 $$025363$$aPhysical Chemistry Chemical Physics$$v14$$y28
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000021243 520__ $$aPoly(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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000021243 650_2 $$2MeSH$$aBenzimidazoles: chemistry
000021243 650_2 $$2MeSH$$aElectric Power Supplies
000021243 650_2 $$2MeSH$$aMembranes, Artificial
000021243 650_2 $$2MeSH$$aPhosphoric Acids: chemistry
000021243 650_2 $$2MeSH$$aPolymers: chemistry
000021243 650_2 $$2MeSH$$aSpectrum Analysis, Raman
000021243 650_7 $$00$$2NLM Chemicals$$aBenzimidazoles
000021243 650_7 $$00$$2NLM Chemicals$$aMembranes, Artificial
000021243 650_7 $$00$$2NLM Chemicals$$aPhosphoric Acids
000021243 650_7 $$00$$2NLM Chemicals$$aPolymers
000021243 650_7 $$00$$2NLM Chemicals$$apoly(benzimidazole)
000021243 650_7 $$07664-38-2$$2NLM Chemicals$$aphosphoric acid
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000021243 7001_ $$0P:(DE-Juel1)VDB106160$$aMajerus, A.$$b1$$uFZJ
000021243 7001_ $$0P:(DE-HGF)0$$aDi Noto, V.$$b2
000021243 7001_ $$0P:(DE-Juel1)140525$$aKorte, C.$$b3$$uFZJ
000021243 7001_ $$0P:(DE-Juel1)129883$$aLehnert, W.$$b4$$uFZJ
000021243 7001_ $$0P:(DE-Juel1)129928$$aStolten, D.$$b5$$uFZJ
000021243 773__ $$0PERI:(DE-600)1476244-4$$a10.1039/c2cp40553a$$gVol. 14, p. 10022 -  10026$$p10022 -  10026$$q14<10022 -  10026$$tPhysical Chemistry Chemical Physics$$v14$$x1463-9076$$y2012
000021243 8567_ $$uhttp://dx.doi.org/10.1039/C2CP40553A
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