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Anion exchange membranes

An anion exchange membrane, ion conductivity technology, applied in the field of anion exchange membrane production, can solve the problems of poor stability of AEM, AEM unsuitable for alkaline fuel cells, etc.

Inactive Publication Date: 2010-01-06
THE SEC OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTYS GOVERNMENT OF THE UK OF GREAT BRITAIN & NORTHERN IRELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A problem with many known AEMs is the poor stability of AEMs especially in concentrated alkaline environments due to the decomposition of the anion exchange groups in concentrated alkaline solutions
However, only very few commercially available AEMs have been developed for other applications, and this AEM is not suitable for use in alkaline fuel cells, especially DBFC

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0044] This example discloses the mutual grafting reaction with vinylbenzyl chloride (VBC) as monomer. The base polymer films used for the films were 50 μm low density polyethylene (LDPE) and 40 μm high density polyethylene (HDPE). Other base polymers, such as ethylene tetrafluoroethylene (ETFE), have also been used, but the resulting membranes did not perform well in property tests.

[0045] Experiments were performed under two conditions: keeping the total dose constant while varying the dose rate (grafting time), and keeping the dose rate constant but varying the total dose.

[0046] The optimal total radiation dose for interfilm was found to be 1 Mrad at low dose rates. Higher total doses produced undesired parasitic reactions (homopolymerization) and resulted in lower DOG. DOG was found to increase at lower dose rates.

[0047] Table 1 demonstrates the effect of diluent composition on the resulting DOGs. It can be seen that DOG is improved by adding methanol.

[0048...

Embodiment 2

[0059] This example discloses the mutual grafting reaction with vinylpyridine (VPy) as monomer. The polymer films used were again 50 μm mL LDPE and 40 μm HDPE.

[0060] Quaternization of the VPy-grafted membranes was carried out by heat treatment with 5M HCl or 2-CA.

[0061] The obtained DOG is 10%-60%. Although a high degree of grafting can be obtained using VPy as a monomer, the performance of the membrane suffers as soon as the DOG exceeds a certain level; DOG above 58% is too brittle to be used as a membrane.

[0062] The results are summarized in Table 4, showing that the VPy-grafted films with DOG > 29%, aminated with 5M HCl or 2-CA had lower surface resistivity.

[0063] Table 4: Properties of VPy-grafted copolymers

[0064]

[0065] This invention was made with US Government support Grant N00014-02-1-0225 awarded by the US Naval Research Institute. The US Government has certain rights in this invention.

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Abstract

The invention relates to an anion exchange membrane. The method for preparing an anion exchange membrane suitable for use in an alkaline fuel cell and particularly in a direct borohydride fuel cell, involves radiation grafting a hydrocarbon polymer film with a monomer and adding a quaternising agent. The degree of grafting is improved by mixing the monomer with a diluent comprising alcohol and a hydrocarbon solvent.

Description

technical field [0001] The present invention relates to the production of anion exchange membranes, in particular anion exchange membranes suitable for use in alkaline fuel cells, more particularly in direct borohydride fuel cells. Background technique [0002] Anion exchange membranes (AEMs) are known and used in a variety of separation and purification applications, such as electrodialysis, salt splitting and metathesis. They can be used as monopolar or bipolar membrane layers; they can be prepared by a number of different techniques, usually by amination of halomethylated polymers with various diamines. EP 0563851 (Fraunhofer) discloses a method for preparing a bipolar membrane comprising an anion-selective layer and a cation-selective layer; said layers are prepared from polymer solutions. JP2003096219 (Asahi Glass) discloses a method for preparing an AEM comprising a polymer having cross-linked polymers formed by reacting an aromatic polysulfonic acid polymer having a ...

Claims

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Application Information

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IPC IPC(8): C08J5/22
CPCY02E60/12Y02E60/522Y02E60/523C08J7/18H01M8/103C08J2353/02H01M8/1039C08J5/2243H01M2300/0082H01M8/1023H01M8/1072Y02P70/50Y02E60/50Y02E60/10C08J5/2218C08J5/2206C08J5/2231H01M50/409
Inventor 达恩·乔纳森·布朗宁基思·维克托·洛弗尔杰奎琳·安妮·霍斯福尔苏珊·克里斯廷·韦林
Owner THE SEC OF STATE FOR DEFENCE IN HER BRITANNIC MAJESTYS GOVERNMENT OF THE UK OF GREAT BRITAIN & NORTHERN IRELAND
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