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Main-chain cobaltocenium containing polymers for AAEMs:

Along with side-chain cobaltocenium containing polymers, main-chaing cobaltocenium containing polymers should be investigated for AAEMs. Polyolefins (saturated hydrocarbon backbon) is relatively inert to nucleophilic attack, or deprotonation by hydroxide ion. Random copolymers norbornene, cyclooctene and diene containing cobaltocenium are promising candidate materials for stable AAEMs. The synthetic routes to these norbornene, cyclooctene and diene containing cobaltocenium monomer are shown in Figure 4.1. The diene containing monomer can be polymerized via acyclic diene metathesis polymerization, and other two monomers can be copolymerized with norbornene, or cyclooctene monomers via ring-opening metathesis polymerization (ROMP) followed by hydrogenation to fabricate flexible, robust and alkaline stable membranes.

Figure 4.1 Proposed synthetic route to the norbornene, cyclooctene and diene containing cobaltocenium monomer

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