Synthesis and characterization of benzoxazine-containing, crosslinkable, and sulfonated polymer through Diels–Alder reaction for direct methanol fuel cells
摘要:
Introduction of cross-linked structure to sulfonated polymers is an effective approach to reduce the methanol permeability of the polymers for application in direct methanol fuel cells. In this work, a crosslinkable sulfonated polymer (sPBz) has been prepared through Diels-Alder reaction with a sulfonated bismaleimide and a benzoxazine-containing bisfuran as monomers. The polymer possesses both sulfonic acid groups and crosslinkable benzoxazine groups. The sulfonic acid group reduces the temperature of the thermal polymerization of benzoxazine groups, and the polymerization of benzoxazine group results in cross-linked sPBz polymer (CR-sPBz). CR-sPBz has showed good film formability, high mechanical strength, flexibility, and solvent resistance. The methanol permeability and proton conductivity of CR-sPBz is 2.52*10(-7) cm(2) s(-1) and 48 mS cm(-1) (60 degrees C), respectively, corresponding to a selectivity (proton conductivity/methanol permeability) of 1.86*10(5) S s cm(-3). The selectivity of CR-sPBz is about 3.4 times of the value of the commercially-available Nafion 117 membrane. The high selectivity of CR-sPBz warrants its performance and suitability for use as a proton exchange membrane for direct methanol fuel cells. (C) 2013 Elsevier Ltd. All rights reserved.
Novel Polymer Electrolyte, Polymer Electrolyte Composition, Electrolyte Membrane, and Production Method and Use Thereof
申请人:Hirano Tetsuji
公开号:US20080171252A1
公开(公告)日:2008-07-17
A polymer electrolyte comprising a hydrophilic segment having a sulfonic acid groups and a hydrophobic segment having no sulfonic acid group, each segment having an aromatic ring in its main chain, wherein the polymer electrolyte is an aromatic block copolymer having an ion-exchange capacity of solely the hydrophilic segment at 3.6 mmol/g or more, and an ion-exchange capacity of the block copolymer in the range of from 0.5 mmol/g to 3.0 mmol/g; a polymer electrolyte membrane produced from the polymer electrolyte and a fuel cell using thereof.
The present invention provides a novel polyimide containing a diamine component that has a fluorene skeleton having a sulfonic acid group or a derivative thereof, and a novel polyimide-based polymer electrolyte membrane containing this polyimide as a main component and having properties based on this polyimide (for example, a good balance between the resistance to methanol crossover and the proton conductivity). The polyimide of the present invention contains a structural unit (P) represented by the following formula (1). The polymer electrolyte membrane of the present invention contains this polyimide as a main component.
[EN] CRYSTALLINE SULFONATED POLYIMIDE BLOCK COPOLYMER PROTON EXCHANGE MEMBRANE, PREPARATION METHOD THEREFOR, AND USE THEREOF<br/>[FR] MEMBRANE ÉCHANGEUSE DE PROTONS À BASE DE COPOLYMÈRE SÉQUENCÉ DE POLYIMIDE SULFONÉ CRISTALLIN, SON PROCÉDÉ DE PRÉPARATION ET UTILISATION ASSOCIÉE<br/>[ZH] 一种结晶性磺化聚酰亚胺嵌段共聚物质子交换膜及其制备方法和应用