Ion exchange compositions, methods for making and materials prepared therefrom
View Patent ↗An ion exchange polymer composition is provided, which includes a primary crosslinker and a secondary crosslinker. The primary crosslinker includes a crosslinked ionic monomer including a quaternary ammonium group. A method for making the ion exchange polymer composition and materials prepared from the ion exchange polymer composition are also provided.
1. An ion exchange polymer composition comprising the polymerization reaction product between (i) a primary crosslinker and (ii) a secondary crosslinker, wherein the primary crosslinker comprises a crosslinked ionic monomer including a quaternary ammonium group, and wherein the crosslinked ionic monomer including a quaternary ammonium group is prepared by a chemical reaction prior to the polymerization reaction between the primary crosslinker and the secondary crosslinker.
2. The composition of claim 1 , wherein the crosslinked ionic monomer including a quaternary ammonium group is the chemical reaction product between a polyepoxide and a tertiary amine including an acryloyl group.
3. The composition of claim 2 , wherein the chemical reaction product between the tertiary amine and polyepoxide is a chemical reaction product formed when the tertiary amine and the polyepoxide are chemically reacted in a molecular ratio of from about 1.0 to about 2.5 moles of the tertiary amine to each equivalent mole of the polyepoxide.
4. The composition of claim 1 , wherein the crosslinked ionic monomer has structure I:
wherein R is —[CH 2 —CH(OH)] 2 —W; R 1 is hydrogen or a C 1 -C 12 alkyl group; 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; and n is an integer from 1 to 20.
5. The composition of claim 1 , wherein the secondary crosslinker is the chemical reaction product between an acrylamide compound and another acrylamide compound including at least one hydroxyl group.
6. A membrane comprising the ion exchange polymer composition of claim 1 .
7. The membrane of claim 6 , wherein the crosslinked ionic monomer including a quaternary ammonium group is the polymerization reaction product between a polyepoxide and a tertiary amine including an acryloyl group.
8. The membrane of claim 6 , wherein the chemical reaction product between the tertiary amine and polyepoxide is a chemical reaction product formed when the tertiary amine and the polyepoxide are chemically reacted in a molecular ratio of from about 1.0 to about 2.5 moles of the tertiary amine to each equivalent mole of the polyepoxide.
9. The membrane of claim 6 , wherein the crosslinked ionic monomer has structure I:
wherein R is —[CH 2 —CH(OH)] 2 —W; R 1 is hydrogen or a C 1 -C 12 alkyl group; 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; and n is an integer from 1 to 20.
10. The membrane of claim 6 , wherein the secondary crosslinker is the polymerization reaction product between an acrylamide compound and another acrylamide compound including at least one hydroxyl group.
11. The membrane of claim 6 , wherein the ion exchange polymer composition is supported by a support membrane.
12. The membrane of claim 6 , wherein the ion exchange membrane has a water content of from about 30% to about 50%.
13. The membrane of claim 6 , wherein the membrane has an ion exchange capacity of from about 1.2 meq/g to about 2.4 meq/g.