Aromatic Polyamides as Reverse Osmosis and Nanofiltration Application

3 Aromatic Polyamides as Reverse Osmosis and Nanofiltration Application 

Konagaya et al. [84] prepared co-PAs from the diamine comonomers 3,3- or 4,4-diaminodiphenylsulfone, piperazine, and isophthaloyl or terephthaloyl diacid dichlorides. The asymmetric membranes prepared from the co-PAs not only have better reverse osmosis performance, but also have higher chlorine resistance properties than NOMEX-t)q e aromatic PAs. 

In different scientific fields and technological process viz. chemical synthesis, mass separation, energy conversion, storage in fuel cell and electrical batteries, ion exchange membranes are useful. PAs have excellent mechanical and thermal properties. However, these materials have not been extensively studied for ion exchange membrane. 

Similar sulfonated PAs structures as proton exchange membranes in fuel cells have been recently proposed by Jo et al. [88]. One of the PAs had a comparable proton conductivity (105 mS/cm) to that of Nation 117 at 80°C. 

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