Sulfonated poly 2-(phenyl ethyl) siloxane polymer...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 5/22 (2006.01) C08G 77/28 (2006.01) C08L 83/08 (2006.01) H01M 2/16 (2006.01)

Patent

CA 2725129

The present invention provides polymer electrolyte membranes (PEM) based upon sulfonated poly 2-(phenyl ethyl) siloxane (SPPES) prepared in a one-pot procedure. This includes the SPPES homopolymer as well as random copolymer of SPPES with various non-sulfonated polysiloxanes. Copolymerization with poly 2- (phenyl ethyl) siloxane greatly improves the mechanical stability of the film compared to a SPPES homopolymer. Proton conductivity of the copolymer, though it is less than that of the homopolymer and Nafion, is comparable to other PEMs in the literature. Both SPPES based membranes show good water retention at temperature greater than 100°C, which indicates they may be suitable for use in high temperature PEM fuel cells.

La présente invention concerne des membranes électrolytes polymères (PEM) à base de poly 2-(phényléthyle) siloxane sulfoné (SPPES) préparées selon une procédure monotope. Cela inclut lhomopolymère SPPES ainsi que le copolymère aléatoire de SPPES avec divers polysiloxanes non sulfonés. La copolymérisation avec le poly 2-(phényléthyle) siloxane améliore considérablement la stabilité mécanique de la pellicule par rapport à un homopolymère SPPES. La conductivité protonique du copolymère, bien quelle soit inférieure à celle de lhomopolymère et du Nafion, est comparable à celle dautres PEM dans la littérature. Les deux membranes à base de SPPES présentent une bonne rétention deau à des températures supérieures à 100°C, ce qui indique quelles peuvent être appropriées pour être utilisées dans des piles à combustible PEM à haute température.

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