Proton-conducting polymer electrolyte membranes based on fluoropolymers incorporating perfluorovinyl ether sulfonic acids and fluoroalkenes Synthesis and characterizations

R. Souzy (1) , Bruno Ameduri (1) , Bernard Boutevin (1) , P. Capron (2) , D. Marsacq (2) , G. Gebel (3)

1 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
2 CESTA - Centre d'études scientifiques et techniques d'Aquitaine
3 SPRAM - UMR 5819 - Structures et propriétés d'architectures moléculaire

This paper presents the synthesis of new polymer electrolyte membranes based on fluoropolymers incorporating aromatic perfluorovinyl ether sulfonic acids. A novel synthetic route describing the preparation of perfluorovinyl ether monomer containing sulfonic functionalities, 4-[(alpha,beta,beta-trifluorovinyl)oxy]benzene sulfonic acid (TFVOBSA), is reported. The radical (co) and terpolymerization of 4-[(alpha,beta,beta-trifluorovinyl)oxy]benzene sulfonyl chloride (TFVOBSC) with 1,1-difluoroethylene (or vinylidene fluoride, VDF), hexafluoropropene (HFP), and perfluoromethyl vinyl ether (PMVE) is described. The terpolymers of TFVOBSC with VDF and HFP, or VDF and PMVE, were hydrolyzed and led also to original fluorinated terpolymers bearing sulfonic acid aromatic side-group. The terpolymers were characterized by 1H and 19F NMR spectroscopies, SEC, DSC and TGA. Membranes incorporating these functional fluoropolymers were prepared and the electrochemical (IEC, proton conductivity, swelling rates) properties were studied and discussed.

Mots clés: electrochemical properties; Proton Exchange Membranes for Fuel Cell; [(trifluorovinyl)oxy] benzene sulfonic acid; vinylidene fluoride (VDF); hexafluoropropene (HFP); perfluoromethyl vinyl ether (PMVE); radical copolymerization; fluoro-membranes; electrochemical properties.

Domaines: Polymères

R. Souzy, Bruno Ameduri, Bernard Boutevin, P. Capron, D. Marsacq, et al.. Proton-conducting polymer electrolyte membranes based on fluoropolymers incorporating perfluorovinyl ether sulfonic acids and fluoroalkenes Synthesis and characterizations. Fuel Cells, 2005, 5 (3), pp.383-397. ⟨10.1002/fuce.200400071⟩. ⟨hal-00382625⟩