Polybenzimidazolium hydroxides - Structure, stability and degradation

被引：101

作者：

Henkensmeier, Dirk ^{[1
]}

Cho, Hyeong-Rae ^{[1
]}

Kim, Hyoung-Juhn ^{[1
]}

Kirchner, Carolina Nunes ^{[2
]}

Leppin, Janine ^{[2
]}

Dyck, Alexander ^{[2
]}

Jang, Jong Hyun ^{[1
]}

Cho, EunAe ^{[1
]}

Nam, Suk-Woo ^{[1
]}

Lim, Tae-Hoon ^{[1
]}

机构：

[1] Korea Inst Sci & Technol, Fuel Cell Res Ctr, Seoul 136791, South Korea

[2] Carl von Ossietzky Univ Oldenburg, Fuel Cells Div, NEXT ENERGY, EWE Forschungszentrum Energietechnol eV, D-26129 Oldenburg, Germany

来源：

POLYMER DEGRADATION AND STABILITY | 2012年 / 97卷 / 03期

关键词：

2-Phenyl-imidazolium hydroxide; NMR; Hydrolysis; Polybenzimidazole; Anion exchange membrane; Polymer electrolyte; EXCHANGE MEMBRANE; FUEL-CELLS; IONOMER;

D O I：

10.1016/j.polymdegradstab.2011.12.024

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

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. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：264 / 272

页数：9

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