Anion conducting polymers based on ether linked polybenzimidazole (PBI-OO)

Title
Anion conducting polymers based on ether linked polybenzimidazole (PBI-OO)
Authors
헨켄스마이어디억조형래Mateusz BrelaArtur MichalakAlexander DyckWiebke GermerNgoc My Hanh Duong장종현김형준남석우임태훈
Keywords
Polybenzimidazole; Anion exchange membrane; Anion conductivity; Imidazolium; DFT calculation
Issue Date
2014-02
Publisher
International journal of hydrogen energy
Citation
VOL 39, NO 6, 2842-2853
Abstract
Anion conducting polymers are potentially interesting for fuel cells, electrochemical pumps, and dye sensitized solar cells. Ether-containing polybenzimidazoles (PBI-OO and PBI-OPO) were synthesized and turned into anion conducting polymers by methylation. The thermal stability was shown to depend on the polymer structure and degree of methylation (dom). Tensile strength and modulus decrease between 50% and 75% dom, but stay constant or slightly increase over 75% dom again. At 65 °C, hydroxide, iodide, chloride, carbonate and bicarbonate conductivities of 0.1, 0.6, 19, 20, 31 mS/cm were obtained, respectively. The low hydroxide conductivity is due to the formation of a C–O bond in position 2 of the imidazolium, which reduces the number of free ions and is known to lead to imidazolium ring opening and further degradation steps. The effect of introduction of phenoxy groups into the main chain on the charge distribution, especially on position 2 and the methyl groups (positive charge on the methyl groups decreases the thermal stability), as well as on the ion bonding was thoroughly investigated by DFT calculations and correlated with experimental data.
URI
http://pubs.kist.re.kr/handle/201004/47158
ISSN
03603199
Appears in Collections:
KIST Publication > Article
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