In light of these results, IBMA was chosen as the best candidate alkyl methacrylate co-monomer suitable for electrodialysis applications due to the lowest water uptake, closer to the targeted values, with the highest stability after the membrane swelling in aqueous media. These results indicated a relationship between alkyl monomer chain length and size and water uptake, with the MMA shorter length chains resulting in lower hydrophobicity and the longer and bulkier IBMA alkyl chains decreasing the polymer membrane water uptake. In light of these results, IBMA was considered the only one of the candidate alkyl methacrylate co-monomers suitable for electrodialysis applications and was the only alkyl co-monomer used in subsequent parameter variation studies. Once fixed the presence of IBMA co-monomer, an evaluation of the co-monomers ratio and crosslinker percentage was carried out.