Anion exchange polymers, methods for making and materials prepared therefrom
View Patent ↗A novel anion exchange polymer is provided. A method of making the anion exchange polymer includes reacting a tertiary amine, an acid inhibitor and a polyepoxide to form a quaternary ammonium monomer and polymerizing the quaternary ammonium monomer in the presence of a catalyst. The exchange polymer is prepared without using alkyl halides and can be used to make improved ion exchange materials that are chemically resistant and non-fouling.
1. An anion exchange polymer having the formula:
wherein R is —[CH 2 —CH(OH)] 2 —W; R 1 is hydrogen or a C 1 -C 12 alkyl group; a is from about 0 to about 0.75, b and c are each independently, from about 0.25 to about 1.0; Z is oxygen or N—R 3 ; R 2 is —[CH 2 ] n —; R 3 is hydrogen or —[CH 2 ] m —CH 3 ; R 4 and R 5 are each, independently, —[CH 2 ] m —CH 3 ; X is selected from the group consisting of Cl, Br, I and acetate; W is a bridging group or atom; m is an integer from 0 to 20; n is an integer from 1 to 20; and Y is selected from the group consisting of
wherein R 6 , R 7 and R 8 are each, independently, selected from the group consisting of hydrogen, —[CH 2 ] q —CH 3 and —CH(CH 3 ) 2 ; R 9 is —[CH 2 ] p ; p is a number from 3 to 6 and q is a number from 0 to 3.
2. The anion exchange polymer of claim 1 wherein R 1 is methyl or ethyl, W is a C 1 -C 30 alkyl group, C 1 -C 30 alkyl ether group, C 6 -C 30 aromatic group, C 6 -C 30 aromatic ether group or a siloxane, m is an integer from 0 to 10 and n is an integer from 1 to 10.
3. The anion exchange polymer of claim 1 wherein a is from about 0.25 to 0.50.
4. An ion exchange material comprising an anion exchange polymer having the formula:
wherein R is —[CH 2 —CH(OH)] 2 —W; R 1 is hydrogen or a C 1 -C 12 alkyl group; a is from about 0 to about 0.75, b and c are each independently, from about 0.25 to about 1.0; Z is oxygen or N—R 3 ; R 2 is —[CH 2 ] n —; R 3 is hydrogen or —[CH 2 ] m —CH 3 ; R 4 and R 5 are each, independently, —[CH 2 ] m —CH 3 ; X is selected from the group consisting of Cl, Br, I and acetate; W is a bridging group or atom; m is an integer from 0 to 20; n is an integer from 1 to 20; and Y is selected from the group consisting of
wherein R 6 , R 7 and R 8 are each, independently, selected from the group consisting of hydrogen, —[CH 2 ] q —CH 3 and —CH(CH 3 ) 2 ; R 9 is —[CH 2 ] p ; p is a number from 3 to 6 and q is a number from 0 to 3.
5. The anion exchange polymer of claim 4 wherein R 1 is methyl or ethyl, W is a C 1 -C 30 alkyl group, C 1 -C 30 alkyl ether group, C 6 -C 30 aromatic group, C 6 -C 30 aromatic ether group or a siloxane, m is an integer from 0 to 10 and n is an integer from 1 to 10.
6. The anion exchange polymer of claim 4 wherein a is from about 0.25 to 0.50.
7. A method for making the ion exchange material of claim 4 comprising reacting a tertiary amine, an acid inhibitor and a polyepoxide to form a quaternary ammonium monomer and polymerizing the quaternary ammonium monomer in the presence of a catalyst.
8. The method of claim 7 wherein the tertiary amine is an ethylenic tertiary amine.
9. The method of claim 8 wherein the tertiary amine is selected from the group consisting of dimethylaminopropylmethacrylamide, dimethylaminopropylacrylamide, diethylaminopropylmethacrylamide, dimethylaminoethylmethacrylate and mixtures thereof.
10. The method of claim 9 wherein the tertiary amine monomer is dimethylaminopropylmethacrylamide.
11. The method of claim 7 wherein the polyepoxide is a diglycidyl ether or a triglycidyl ether.
12. The method of claim 11 wherein the polyepoxide is selected from the group consisting of diethylene glycol diglycidyl ether, diglycidyl 1,2-cyclohexanedicarboxylate, N,N-diglycidyl-4-glycidyloxyaniline, bisphenol A diglycidyl ether, brominated bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,4-butanediyl diglycidyl ether, 1,4-cyclohexanedimethanol diglycidyl ether, glycerol diglycidyl ether, resorcinol diglycidyl ether, bis[4-(glycidyloxy)phenyl]methane, bisphenol A propoxylate diglycidyl ether, dimer acid diglycidyl ester, ethylene glycol diglycidyl ether, brominated neopentyl glycol diglycidyl ether, diglycidyl ether-terminated poly(dimethylsiloxane), poly(ethylene glycol) diglycidyl ether, poly(propyleneglycol) diglycidyl ether, 1,2,3-propanetriol glycidyl ether, 1,3-butanediol diglycidyl ether, tris(2,3-epoxypropyl)isocyanurate, trimethylolpropane triglycidyl ether, tris(4-hydroxyphenyl)methane triglycidyl ether 2,6-tolylene diisocyanate, tris(4-hydroxyphenyl)methane triglycidyl ether, glycerol propoxylate triglycidyl ether and trimethylolethane triglycidyl ether.
13. The method of claim 7 wherein the reaction is heated from about 40° C. to about 150° C. from about 1 minute to about 2 hours.
14. The method of claim 7 wherein the acid inhibitor is hydrochloric acid, methane sulfonic acid, sulfuric acid or phosphoric acid.
15. The method of claim 7 wherein the ratio of the moles of tertiary amine per equivalent mole of the polyepoxide is from about 0.3 to about 1.5.
16. The method of claim 7 further comprising adding an ethylenic monomer.
17. The method of claim 16 wherein the ethylenic monomer is selected from the group consisting of methacrylamine, N-methylmethacrylamide, N-vinyl pyrrolidinone, N-vinyl caprolactam, methacrylamidopropyl trimethylammonium chloride and trimethylammoniumethyl methacrylate chloride.
18. The ion exchange material of claim 4 wherein the ion exchange material is an anion exchange membrane.