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Sulfonated copolymer

A technology for sulfonated copolymers and comonomers, applied in the direction of electrochemical generators, chemical instruments and methods, structural parts, etc., can solve problems such as loss and battery performance degradation

Inactive Publication Date: 2005-09-14
POLYFUEL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the membrane will gradually lose its ability to limit methanol permeation, resulting in reduced battery performance

Method used

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  • Sulfonated copolymer
  • Sulfonated copolymer
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Sulfonated PEEK with bisphenol A composition

[0063] In a 500 ml three necked round bottom flask equipped with mechanical stirring, thermometer, nitrogen inlet and Dean-Stark trap / condenser, bisphenol A (9.128 g), 4,4'-difluoro Benzophenone (5.6732 g), sulfonated 4,4'-difluorobenzophenone (5.9108 g), anhydrous potassium carbonate (7.2 g) were dissolved in a mixture of DMSO and toluene (about 20% solids concentration) . The mixture was heated to reflux of toluene with stirring and held at 150°C for 4 hours, then the temperature was increased to 175-180°C and held for 6 hours. The reaction mixture was precipitated with acetone or methanol to obtain a crude product, which was then washed 4 times with hot water. The dry polymer was then dissolved in DMAC to make a 20% coating solution. The resulting 2 mil thick film was immersed in 1.5M H 2 SO 4 16 hours (overnight), followed by several rinses with deionized water until no residual H 2 SO 4 .

[0064] The polymer f...

Embodiment 2

[0069] Sulfonated PEEK with 50% bisphenol A and 50% hydroquinone composition

[0070] In a 500ml three necked round bottom flask equipped with mechanical stirring, thermometer, nitrogen inlet and Dean-Stark trap / condenser, bisphenol A (4.564g), hydroquinone (2.202g), 4,4'-difluorobenzophenone (5.6732 g), sulfonated 4,4'-difluorobenzophenone (5.9108 g) and anhydrous potassium carbonate (7.2 g) were dissolved in a mixture of DMSO and toluene ( The solids concentration is about 20%). The mixture was heated to reflux of toluene with stirring at 150°C for 4 hours, then the temperature was increased to 180°C and held for 6 hours. The reaction mixture was precipitated with acetone or methanol to obtain a crude product, which was then washed 4 times with hot water. The dry polymer was then dissolved in DMAC to make a 20% coating solution. The resulting 2 mil thick film was immersed in 1.5M H 2 SO 4 16 hours (overnight), followed by several rinses with deionized water until no res...

Embodiment 3

[0073] Sulfonated PEEK with 4,4'-thiobisphenol composition

[0074] In a 500 ml three necked round bottom flask equipped with mechanical stirring, thermometer, nitrogen inlet and Dean-Stark trap / condenser, 4,4'-thiobisphenol (8.728 g), 4 , 4'-difluorobenzophenone (5.6732g), sulfonated 4,4'-difluorobenzophenone (5.9108g) and anhydrous potassium carbonate (7.2g) were dissolved in a mixture of DMSO and toluene (solid concentration is about 20%). The mixture was heated to reflux of toluene with stirring and held at 150°C for 4 hours, then the temperature was increased to 175-180°C and held for 6 hours. The reaction mixture was precipitated with acetone or methanol to obtain a crude product, which was then washed 4 times with hot water.

[0075] Conductivity of the membrane: 0.021S / cm

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Abstract

This invention relates to ion conducting random copolymers that are useful in forming polymer electrolyte membranes used in fuel cells.

Description

technical field [0001] The present invention relates to sulfonated copolymers which are useful in forming polymer electrolyte membranes for use in fuel cells. Background of the invention [0002] Fuel cells have been designed as promising energy sources for portable electronic devices, electrical carriers, and other applications mainly due to their non-polluting nature. Among various fuel cell systems, fuel cell technologies based on polymer electrolyte membranes, such as direct methanol fuel cells (DMFC), have attracted great interest because of their high energy density and high energy conversion efficiency. The core of a polymer electrolyte membrane-based fuel cell is the so-called "membrane-electrode assembly (MEA)", which consists of a proton-conducting polymer electrolyte membrane (PEM), a catalyst (forming a coated catalyst-coated membrane (CCM)) and a pair of electrodes (ie, cathode and anode) in electrical contact with the catalyst layer. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D71/52B01D71/82C08F16/00C08F16/36C08G65/40C08G65/48C08L71/00C08L81/06H01M8/10
CPCH01M8/1011Y02E60/523H01M8/1032C08L81/06H01M2300/0082C08G2650/40C08G65/4012H01M8/1027H01M4/881C08L71/00C08G2650/64B01D71/82B01D67/0088C08G65/48B01D71/52H01M8/1025C08G2650/02Y02E60/50
Inventor S·曹H·徐J·陈T·珍妮斯K·H·南D·奥尔梅杰
Owner POLYFUEL INC
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