Original Research Paper
Cross-Linking of Sulfonated Poly(ether ether ketone) by Thermal Treatment: How Does the Reaction Occur?
Article first published online: 18 FEB 2013
Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Volume 13, Issue 2, pages 107–117, April, 2013
How to Cite
Maranesi, B., Hou, H., Polini, R., Sgreccia, E., Alberti, G., Narducci, R., Knauth, P. and Di Vona, M. L. (2013), Cross-Linking of Sulfonated Poly(ether ether ketone) by Thermal Treatment: How Does the Reaction Occur?. Fuel Cells, 13: 107–117. doi: 10.1002/fuce.201200010
- Issue published online: 5 APR 2013
- Article first published online: 18 FEB 2013
- Manuscript Accepted: 24 SEP 2012
- Manuscript Received: 20 JAN 2012
- EU-FP7 (FCH-JU). Grant Number: GA 245339
- Fuel Cell;
- Hydrocarbon Polymer;
- Polymer Electrolyte;
The cross-link reaction between macromolecular chains of sulfonated poly(ether ether ketone) (SPEEK) by thermal treatment above 150 °C in presence of dimethylsulfoxide (DMSO) is investigated by various techniques, including elemental analysis, acid-base titration, infrared spectroscopy, water uptake (WU) measurements, and thermogravimetry. The conditions of thermal treatment are analyzed. The cross-linking reaction occurs in at least three more or less activated and deactivated positions with different activation energies, leading to different time dependencies of the cross-link reaction. The role of residual solvent DMSO is studied particularly: the cross-linking depends significantly on the amount of solvent in the membranes. Implications on WU and thermal stability are of particular importance for the development of high performance proton-conducting membranes.