Preparation of metallocene containing cationic polymers for anion exchange applications
Chemically inert, mechanically tough, cationic metallo-polyelectrolytes designed as durable anion-exchange membranes (AEMs) via ring-opening metathesis polymerization (ROMP) of cobaltocenium-containing cyclooctene with triazole as the only linker group, followed by backbone hydrogenation to provide a new class of AEMs with a polyethylene-like framework and alkaline-stable cobaltocenium cation for ion transport, which exhibit excellent thermal, chemical and mechanical stability, as well as high ion conductivity.
1 . An anion-exchange membrane comprising at least one copolymer formed via a reaction scheme comprising:
2 . The anion-exchange membrane of claim 1 , wherein the anion-exchange membrane is not soluble in polar aprotic solvents.
3 . The anion-exchange membrane of claim 1 , wherein the anion-exchange membrane is flexible.
4 . The anion-exchange membrane of claim 1 , wherein the anion-exchange membrane is incorporated into a fuel cell.
5 . The anion-exchange membrane of claim 1 , wherein the anion-exchange member exhibits one hundred percent elongation.
6 . The anion-exchange membrane of claim 1 , wherein the anion-exchange member exhibits conductivity over 90 mS/cm at 90° C.
7 . The anion-exchange membrane of claim 1 , wherein a number of absorbed water molecules per cobaltocenium cation ranges from 11.2 to 11.6.
8 . The anion-exchange membrane of claim 1 , wherein the anion-exchange exhibits an initial hydroxide conductivity over 95% after soaking in 1 M NaOH at 80° C. for one month.