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US 8,008,361 B2Granted
Method for preparing a poly(aryl ether) anion-exchange membrane
OwnerLin Zhuang, Jing Pan +3inventors
InventorsLin Zhuang, Jing Pan, Aibin Huang, Shanfu Lu, Juntao Lu
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Abstract
A method for preparing a polymer anion-exchange membrane by forming a chloromethylated polymer, quaternizing the chloromethylated polymer, and casting. The method is simple to use and the obtained polymer anion-exchange membrane has good mechanical properties, improved thermal and chemical stability, as well as high ion-exchange capacity.
Claims15
A method for preparing a polymer anion-exchange membrane, comprising the steps of:
- (a) dissolving in a first solvent, 1 weight part of a polymer comprising in its main chain benzene and ether repeat units;
- adding between 0.05 and 0.5 weight parts of zinc powder or aluminum powder and between 0.1 and 1 weight parts of a fluorine-containing organic acid;
- adding between 1 and 5 weight parts of chloromethyl methyl ether;
- and stirring at between 20° C. and 50° C. for between 2 and 20 hours to yield a first reaction mixture comprising a chloromethylated polymer;
- pouring said first reaction mixture into a lower alcohol to precipitate said chloromethylated polymer;
- and optionally, washing, grinding, and drying said chloromethylated polymer;
- (b) dissolving in a second solvent said chloromethylated polymer obtained in step (a) to yield a solution of said chloromethylated polymer;
- vaporizing a trimethylamine solution to obtain trimethylamine vapor, drying said trimethylamine vapor to obtain dried trimethylamine vapor;
- and passing said dried trimethylamine vapor through said solution of said chloromethylated polymer for not less than 5 minutes to yield a quaternary ammonium polymer solution;
- and
- (c) casting said quaternary ammonium polymer solution and drying at between 40° C. and 100° C.
8 more elements
A method for preparing a polymer anion-exchange membrane, comprising the steps of:
- (a) dissolving in a first solvent:
- 1 weight part of a polymer comprising in its main chain benzene and ether repeat units;
- adding between 0.05 and 0.5 weight parts of zinc powder or aluminum powder and between 0.1 and 1 weight parts of a fluorine-containing organic acid;
- adding between 1 and 5 weight parts of chloromethyl methyl ether;
- and stirring at between 20° C. and 50° C. for between 2 and 40 hours to yield a first reaction mixture comprising a chloromethylated polymer;
- pouring said first reaction mixture into a lower alcohol to precipitate said chloromethylated polymer;
- and optionally, washing, grinding and drying said chloromethylated polymer;
- (b) dissolving in a second solvent:
- 1 weight part of said chloromethylated polymer obtained in step (a) to yield a solution of said chloromethylated polymer;
- adding between 0.3 and 0.5 weight parts of a lower amine, said lower amine being in a liquid form;
- and stirring at between 40° C. and 70° C. for between 2 and 15 hours;
- and to yield a quaternary ammonium polymer solution;
- and
- (c) casting said quaternary ammonium polymer solution and drying at between 40° C. and 100° C.
11 more elements
Dependencies are inferred from the claim text.