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Polybenzimidazoles conducteurs ioniques

Julien Jouanneau 1
1 LMOPS - Matériaux organiques à propriétés spécifiques
LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces
Abstract : Over the last years, many research works have been focused on new clean energy systems. Hydrogen fuel cell seems to be the most promising one. However, the large scale development of this technology is still limited by some key elements. One of them is the polymer electrolyte membrane Nafion® currently used, for which the ratio performance/cost is too low. The investigations we carried out during this PhD work are related to a new class of ionic conducting polymer, the sulfonated polybenzimidazoles (sPBI).
Polybenzimidazoles (PBI) are aromatic heterocyclic polymers well-known for their excellent thermal and chemical stability. Ionic conduction properties are obtained by having strong acid groups (sulfonic acid SO3H) on the macromolecular structure. For that purpose, we first synthesized sulfonated monomers. Their polycondensation with an appropriate non-sulfonated co-monomer yields to sPBI with sufonation range from 0 to 100%. Three different sPBI structures were obtained, and verified by appropriate analytical techniques. We also showed that the protocol used for the synthesis resulted in high molecular weights polymers.
We prepared ionic conducting membrane by casting sPBI solutions on glass plates. Their properties of stability, water swelling and ionic conductivity were investigated. Surprisingly, the behaviour of sPBI was quite different from the other sulfonated aromatic polymers with same amount of SO3H, their stability was much higher, but their water swelling and ionic conductivity were quite low. We attributed these differences to strong ionic interactions between the sulfonic acid groups and the basic benzimidazole groups of our polymers. However, we managed to solve this problem synthesizing very highly sulfonated PBI, obtaining membranes with a good balance between all the properties necessary.
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Contributor : Julien Jouanneau <>
Submitted on : Monday, December 11, 2006 - 2:01:00 PM
Last modification on : Thursday, November 19, 2020 - 1:50:07 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 8:49:25 PM


  • HAL Id : tel-00119603, version 1



Julien Jouanneau. Polybenzimidazoles conducteurs ioniques. Matériaux. Université de Savoie, 2006. Français. ⟨tel-00119603⟩



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