Proton-conducting membrane for electrochemical use

• Main Authors: PEREIRA NUNES, SUZANA, JAKOBY, KAI, PEINEMANN, KLAUS-VICTOR
• Format: Patent
• Language: English; French; German
• Published: 19.05.2004
• Edition: 7
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SEPARATION; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

A proton conducting membrane for electrochemical applications, especially for fuel cells, from a polymer based on a polymer with an aromatic ring but not a vinyl polymer, where the polymer with the aromatic ring has phosphonic acid groups, which are covalently bonded directly without spacer groups to the aromatic ring is new. Independent claims are included for: (1) the polymer with the aromatic ring, which is a prepolymer with phosphonic acid groups as above; and (2) a process for obtaining the base polymer (BP) by the steps: (a) bromination or iodination of the BP; (b) reaction of the halogenated BP in (a) with phosphonic and/or phosphoric acid esters in the presence of a transition metal catalyst, (c) hydrolysis of the polymer obtained in (b) and (d) conversion of the polymer obtained in (c) to a membrane in the form of a polymer film by a known method. Bereitgestellt wird einen protonenleitfähige Membran für elektrochemische Anwendungen, insbesondere für Brennstoffzellen, aus einem Polymer auf Basis eines aromatische Ringe aufweisenden Basispolymers, bei dem es sich nicht um ein Vinylpolymer handelt. Das Polymer weist SulfonsäureGruppen, die kovalent direkt und somit ohne eine Spacer-Gruppe an die aromatischen Ringe des Basispolymers gebunden sind.