The authors reported a series of poly(alkyl-biphenyl pyridinium) AEMs with a hydrophobic side chain for mono-/divalent anions separation using electrodialysis (ED). Interestingly, the quaternized product had excellent solubility in common organic solvents, making it flexible to form homogeneous membranes by a solution-casting method. The membranes were adequate for the selective separation of OH- much higher than that of the Neosepta ACS membrane. The microphase separation is favorable to the active transport of Cl- as compared with SO42- ion giving a high permselectvity of 11.9 in a mixed salts (NaCl/Na2SO4) system. The authors organized the data very well, and the experimental data supported the logic and hypothesis being made during this study. I recommend this article for publication in Industrial Chemistry & Materials after the authors may revise the article according to the following comments.

In Sec. 1. Please cite the appropriate study for the statement "direct addition of or in-situ produced chloromethyl methyl ether is carcinogenic...."

In Sec. 4.2. What was the pH level before washing?

Fig. 1c. The peak intensity of C-N+ grew with the increase of 1-bromopentane concentration. However, it can be seen in Fig. 1c that the peak intensity of QPAB-4 (19.64 mmol 1-bromopentane) was less than that of QPAB-3 (14.73 mmol 1-bromopentane). Please recheck the data points and figure legends.

Please elaborate on the rapid degradation of the membrane under alkaline conditions in the case of the Neosepta ACS membrane.

The authors observed excellent chemical stability in the case of QPAB-x. Furthermore, no damage or degradation was observed, showing the membranes' higher efficiency. Discussing the inhibitory/preventive mechanisms responsible for membrane stability will be great.

Please revise it "In this work, a series of MAPMs with excellent permselectivity were fabricated by a two-step synthesized route for monovalent/divalent anions separation in the ED process."

This manuscript has been greatly improved after the revision and could be accepted for publication.