Abstract
Methylated polybenzimidazole (O-PBI) based anion exchange membranes with a degree of methylation of ca. 78% were prepared in the iodide, chloride, carbonate, bicarbonate, and hydroxide form. Swelling in water showed a high anisotropy for chloride and carbonate exchanged membranes and a strong plasticizing effect of water was confirmed by DMA. Carbonate and bicarbonate exchanged membranes revealed an ionomer peak around 0.25 Å<sup>-</sup><sup>1</sup> in SAXS measurements suggesting a phase separated morphology. Theoretical DFT calculations were used to characterize geometries and electronic structure of polymer models and interactions with different anions, and to rationalize the water uptake/swelling behavior. Anion exchange membranes are prepared from methylated polybenzimidazole and are exchanged with various anions. Thermal and mechanical properties are evaluated. Unlike other anions, carbonate and bicarbonate exchanged membranes reveal an ionomer peak in SAXS measurements suggesting a phase separated morphology. Water uptake and swelling behavior are rationalized by theoretical DFT calculations.
| Original language | English |
|---|---|
| Pages (from-to) | 497-509 |
| Number of pages | 13 |
| Journal | Macromolecular Materials and Engineering |
| Volume | 300 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2015 May 1 |
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Keywords
- Anion exchange membranes
- Computer modeling
- Ion exchange
- Mechanical properties
- Thermal properties
ASJC Scopus subject areas
- Organic Chemistry
- Materials Chemistry
- Polymers and Plastics
- Chemical Engineering(all)
Cite this
Phase separated methylated polybenzimidazole (O-PBI) based anion exchange membranes. / Germer, Wiebke; Leppin, Janine; Kirchner, Carolina Nunes; Cho, Hyeongrae; Kim, Hyoung Juhn; Henkensmeier, Dirk; Lee, Kwan Young; Brela, Mateusz; Michalak, Artur; Dyck, Alexander.
In: Macromolecular Materials and Engineering, Vol. 300, No. 5, 01.05.2015, p. 497-509.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Phase separated methylated polybenzimidazole (O-PBI) based anion exchange membranes
AU - Germer, Wiebke
AU - Leppin, Janine
AU - Kirchner, Carolina Nunes
AU - Cho, Hyeongrae
AU - Kim, Hyoung Juhn
AU - Henkensmeier, Dirk
AU - Lee, Kwan Young
AU - Brela, Mateusz
AU - Michalak, Artur
AU - Dyck, Alexander
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Methylated polybenzimidazole (O-PBI) based anion exchange membranes with a degree of methylation of ca. 78% were prepared in the iodide, chloride, carbonate, bicarbonate, and hydroxide form. Swelling in water showed a high anisotropy for chloride and carbonate exchanged membranes and a strong plasticizing effect of water was confirmed by DMA. Carbonate and bicarbonate exchanged membranes revealed an ionomer peak around 0.25 Å-1 in SAXS measurements suggesting a phase separated morphology. Theoretical DFT calculations were used to characterize geometries and electronic structure of polymer models and interactions with different anions, and to rationalize the water uptake/swelling behavior. Anion exchange membranes are prepared from methylated polybenzimidazole and are exchanged with various anions. Thermal and mechanical properties are evaluated. Unlike other anions, carbonate and bicarbonate exchanged membranes reveal an ionomer peak in SAXS measurements suggesting a phase separated morphology. Water uptake and swelling behavior are rationalized by theoretical DFT calculations.
AB - Methylated polybenzimidazole (O-PBI) based anion exchange membranes with a degree of methylation of ca. 78% were prepared in the iodide, chloride, carbonate, bicarbonate, and hydroxide form. Swelling in water showed a high anisotropy for chloride and carbonate exchanged membranes and a strong plasticizing effect of water was confirmed by DMA. Carbonate and bicarbonate exchanged membranes revealed an ionomer peak around 0.25 Å-1 in SAXS measurements suggesting a phase separated morphology. Theoretical DFT calculations were used to characterize geometries and electronic structure of polymer models and interactions with different anions, and to rationalize the water uptake/swelling behavior. Anion exchange membranes are prepared from methylated polybenzimidazole and are exchanged with various anions. Thermal and mechanical properties are evaluated. Unlike other anions, carbonate and bicarbonate exchanged membranes reveal an ionomer peak in SAXS measurements suggesting a phase separated morphology. Water uptake and swelling behavior are rationalized by theoretical DFT calculations.
KW - Anion exchange membranes
KW - Computer modeling
KW - Ion exchange
KW - Mechanical properties
KW - Thermal properties
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UR - http://www.scopus.com/inward/citedby.url?scp=84928924601&partnerID=8YFLogxK
U2 - 10.1002/mame.201400345
DO - 10.1002/mame.201400345
M3 - Article
AN - SCOPUS:84928924601
VL - 300
SP - 497
EP - 509
JO - Macromolecular Materials and Engineering
JF - Macromolecular Materials and Engineering
SN - 1438-7492
IS - 5
ER -