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M.  Kulkarni, Potrekar, R., Kulkarni, R. A., and Vernekar, S. P., ?Nitrophenoxy groups containing polybenzimidazoles as polymer electrolytes for fuel cells: synthesis and characterization?, Journal of Applied Polymer Science, vol. 117, no. 6, pp. 3282-3292, 2010.

R. S.  Bhavsar, Nahire, S. B., Kale, M. S., Patil, S. G., Aher, P. P., Bhavsar, R. A., and Kharul, U. K., ?Polybenzimidazoles based on 3,3 `-diaminobenzidine and aliphatic dicarboxylic acids: synthesis and evaluation of physicochemical properties toward their applicability as proton exchange and gas separation membrane material?, Journal of Applied Polymer Science, vol. 120, no. 2, pp. 1090-1099, 2011.

B. P.  Biswal, Chaudhari, H. D., Banerjee, R., and Kharul, U. K., ?Chemically stable covalent organic framework (COF)-polybenzimidazole hybrid membranes: enhanced gas separation through pore modulation?, Chemistry-A European Journal, vol. 22, no. 14, pp. 4695-4699, 2016.

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M. V.  Patwadkar, Illathvalappil, R., Torris, A., Francis, S. C., Kurungot, S., and Badiger, M. V., ?High-performance sultone-modified PVA/PAMPS semi-IPN hydrogels for proton exchange membranes?, Journal of Applied Polymer Science, vol. 143, no. 15, 2026.

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