Proton conducting membranes, aromatic

Hiibner, G. and Roduner, E. 1999. EPR investigation of HO radical initiated degradation reactions of sulfonated aromatics as model compounds for fuel cell proton conducting membranes. Journal of Materials Chemistry 9 409- 18. 

Asano, N., Aoki, M., Suzuki, S., Miyatake, K., Uchida, H. and Watanabe, M. 2006. Aliphatic/aromatic polyimide ionomers as a proton conductive membrane for fuel cell applications. Journal of the American Chemical Society 128 1762-1769. 

Originality Proton-conducting membranes consisting of aromatic sulfonic acid block... 

Aromatic condensing polymers with fragments of benzimidazole or quinoxaline as base in electrolytic proton-conducting membranes 02UK862. 

The following chapters give an overview of the most recent developments in the field of aromatic proton conducting membranes. Additional information, especially on previous literature, can be found in a number of preceding reviews [1,6-12]. 

Different strategies have been described in the hterature for obtaining cross-Unked aromatic proton conductive membranes based on polyphos-phazene [108], polysulfone [109], and polymer blends [110]. However, as mentioned by Kerres in a review article [111], ionically cross-linked membranes are not suitable for high-temperature apphcations because of excessive water membrane swelling. Accordingly, particular interest has been devoted... 

Sgreccia, E., Chailan, J.F., Khadhraoui, M., Di Vona, M.L., Knautha, R, Mechanical properties of proton-conducting sulfonated aromatic polymer membranes Stress-strain tests and dynamical analysis, J. Power Sources, 2010, 195, 7770-7775. 

Linear arrays of protonatable or hydrogen bonded sites may allow the directed long range transfer of protons, thus functioning as proton-conducting channel, i.e., as proton wire. Relevant systems would be linear polyamines or polyphenolic condensed aromatic units [8.218], self-assembled hydrogen bonded heterocyclic ribbons such as 116 (see Section 9.4.4) or polyelectrolyte membranes [8.219] in which collective proton motion may take place and lead to proton conductivity. 

An interesting application of proton-electron conducting membranes has recently been reported by Li et al. [2.76]. These authors studied the conversion of CH4 first to C2H4 and its subsequent direct catalytic aromatization to benzene and other valuable aromatic hydrocarbons. Their reactor configuration is shown schematically in Figure 2.3. The two distinct additional features of their work are the use of an active catalyst for the reaction itself, (Mo/H-ZSM5), and the use of asymmetric membranes with a thin (10-30 pm)... 

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