Polybenzimidazolium hydroxides - Structure, stability and degradation

Dirk Henkensmeier, Hyeong Rae Cho, Hyoung Juhn Kim, Carolina Nunes Kirchner, Janine Leppin, Alexander Dyck, Jong Hyun Jang, Eunae Cho, SukWoo Nam, Tae Hoon Lim

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

Polybenzimidazolium hydroxides are of potential interest for the use in alkaline anion exchange membrane fuel cells (AAEMFC). Introduction of an ether group in para-position of the 2-phenyl substituent improves the mesomeric stabilization of imidazolium cations, and O-PBI seems to be more stable than meta-PBI under alkaline conditions. NMR, IR and XPS analysis show a structural change when the iodide form is exchanged into the hydroxide form. Surprisingly, this structural change is subject to a pH sensitive equilibrium and the pure imidazolium form is retained immediately when the pH is lowered. The molecular structure at high pH is either the 2-carbinol or the amine-amide. Further hydrolysis necessitates excess hydroxide.

Original languageEnglish
Pages (from-to)264-272
Number of pages9
JournalPolymer Degradation and Stability
Volume97
Issue number3
DOIs
Publication statusPublished - 2012 Mar 1
Externally publishedYes

Fingerprint

Hydroxides
Amides
Molecular structure
hydroxides
Fuel cells
Amines
Hydrolysis
Ethers
Ion exchange
Negative ions
X ray photoelectron spectroscopy
Stabilization
Positive ions
Nuclear magnetic resonance
degradation
Membranes
Degradation
Iodides
Ether
Anions

Keywords

  • 2-Phenyl-imidazolium hydroxide
  • Anion exchange membrane
  • Hydrolysis
  • NMR
  • Polybenzimidazole
  • Polymer electrolyte

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry
  • Mechanics of Materials
  • Condensed Matter Physics

Cite this

Henkensmeier, D., Cho, H. R., Kim, H. J., Nunes Kirchner, C., Leppin, J., Dyck, A., ... Lim, T. H. (2012). Polybenzimidazolium hydroxides - Structure, stability and degradation. Polymer Degradation and Stability, 97(3), 264-272. https://doi.org/10.1016/j.polymdegradstab.2011.12.024

Polybenzimidazolium hydroxides - Structure, stability and degradation. / Henkensmeier, Dirk; Cho, Hyeong Rae; Kim, Hyoung Juhn; Nunes Kirchner, Carolina; Leppin, Janine; Dyck, Alexander; Jang, Jong Hyun; Cho, Eunae; Nam, SukWoo; Lim, Tae Hoon.

In: Polymer Degradation and Stability, Vol. 97, No. 3, 01.03.2012, p. 264-272.

Research output: Contribution to journalArticle

Henkensmeier, D, Cho, HR, Kim, HJ, Nunes Kirchner, C, Leppin, J, Dyck, A, Jang, JH, Cho, E, Nam, S & Lim, TH 2012, 'Polybenzimidazolium hydroxides - Structure, stability and degradation', Polymer Degradation and Stability, vol. 97, no. 3, pp. 264-272. https://doi.org/10.1016/j.polymdegradstab.2011.12.024
Henkensmeier D, Cho HR, Kim HJ, Nunes Kirchner C, Leppin J, Dyck A et al. Polybenzimidazolium hydroxides - Structure, stability and degradation. Polymer Degradation and Stability. 2012 Mar 1;97(3):264-272. https://doi.org/10.1016/j.polymdegradstab.2011.12.024
Henkensmeier, Dirk ; Cho, Hyeong Rae ; Kim, Hyoung Juhn ; Nunes Kirchner, Carolina ; Leppin, Janine ; Dyck, Alexander ; Jang, Jong Hyun ; Cho, Eunae ; Nam, SukWoo ; Lim, Tae Hoon. / Polybenzimidazolium hydroxides - Structure, stability and degradation. In: Polymer Degradation and Stability. 2012 ; Vol. 97, No. 3. pp. 264-272.
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