Sulphur-containing and sulphonated aromatic perfluoroalkane monomer
A sulphur-containing and sulphonated aromatic perfluoroalkane monomer is provided that can be used for the manufacture of a polymer membrane for a PEM-type fuel cell. The perfluoroalkane monomer is a functionalized polymer that has a structure corresponding to a formula (I): E 1 -Ar 1 —X 1 —(CF 2 ) n —X 2 —Ar 2 -E 2 (I) in which: n is in a range from 1 to 20; X 1 and X 2 , which are identical or different, represent S, SO, or SO 2 ; Ar 1 , Ar 2 , which are identical or different, represent a phenylene group, at least one of Ar 1 and Ar 2 bearing a sulphonic (—SO 3 H) group or a sulphonate (—SO 3 M) group, in which M represents an alkali metal cation; and E 1 and E 2 , which are identical or different, represent an electrophilic group such as a halogen, specifically fluorine or chlorine.
1. A sulphur-containing and sulphonated aromatic perfluoroalkane monomer corresponding to a formula (I):
E 1 -Ar 1 —X 1 —(CF 2 ) n —X 2 —Ar 2 -E 2 (I)
in which:
n is in a range from 1 to 20;
X 1 and X 2 , which are identical or different, represent S, SO, or SO 2 ;
Ar 1 , Ar 2 , which are identical or different, represent a phenylene group, at least one of Ar 1 and Ar 2 bearing a sulphonic (—SO 3 H) group or a sulphonate (—SO 3 M) group, in which M represents an alkali metal cation; and
E 1 and E 2 , which are identical or different, represent an electrophilic functional group.
2. The monomer according to claim 1 , wherein n is in a range from 2 to 20.
3. The monomer according to claim 1 , wherein n is in a range from 2 to 8.
4. The monomer according to claim 1 , wherein E 1 and E 2 , which are identical or different, are chosen from the group consisting of halogen, carboxyl, acyl chloride, sulphonyl chloride, sulphonyl fluoride, isocyanate, and combinations thereof.
5. The monomer according to claim 4 , wherein E 1 and E 2 , which are identical or different, represent halogens.
6. The monomer according to claim 5 , wherein the monomer corresponds to a formula (II):
F—Ar 1 —X 1 —(CF 2 ) n —X 2 —Ar 2 —F (II).
7. The monomer according to claim 5 , wherein the monomer corresponds to a formula (III):
Cl—Ar 1 —X 1 —(CF 2 ) n —X 2 —Ar 2 —Cl (III).
8. The monomer according to claim 1 , wherein n is equal to 4.
9. The monomer according to claim 2 , wherein n is equal to 4.
10. The monomer according to claim 3 , wherein n is equal to 4.
11. The monomer according to claim 4 , wherein n is equal to 4.
12. The monomer according to claim 5 , wherein n is equal to 4.
13. The monomer according to claim 6 , wherein n is equal to 4.
14. The monomer according to claim 7 , wherein n is equal to 4.