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Issue 27, 2012
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High performance sulfonated poly(arylene ether phosphine oxide) membranes by self-protected cross-linking for fuel cells

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Abstract

This work investigated the thermal treatment of sulfonated poly(arylene ether phosphine oxide) membranes under vacuum without using any cross-linking agents or additives. During the thermal treatment, the sulfonic acid groups of the membranes acted as cross-linkable groups and reacted with the activated benzene rings in the membranes, resulting in self-cross-linking. Interestingly, the available degree of cross-linking of the membranes almost no longer increased with increasing time and temperature after the required thermal treatment because many sulfonic acid groups of the membranes could not be cross-linked due to steric hindrance and only functioned as a conducting group of protons. Meanwhile, this approach facilitated the cross-linked membranes to exhibit excellent dimensional stability, as well as high proton conductivity. This is a self-protected cross-linking to some extent. Through such a cross-linking, phosphine oxide-containing membranes with excellent overall properties were achieved. In addition, this effect of steric hindrance could be employed to design cross-linked proton exchange membranes with high performance.

Graphical abstract: High performance sulfonated poly(arylene ether phosphine oxide) membranes by self-protected cross-linking for fuel cells

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Publication details

The article was received on 17 Mar 2012, accepted on 15 May 2012 and first published on 16 May 2012


Article type: Paper
DOI: 10.1039/C2JM31659E
J. Mater. Chem., 2012,22, 13714-13722

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    High performance sulfonated poly(arylene ether phosphine oxide) membranes by self-protected cross-linking for fuel cells

    L. Fu, G. Xiao and D. Yan, J. Mater. Chem., 2012, 22, 13714
    DOI: 10.1039/C2JM31659E

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