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S. C.  Kumbharkar, Karadkar, P. B., and Kharul, U. K., ?Enhancement of gas permeation properties of polybenzimidazoles by systematic structure architecture?, Journal of Membrane Science, vol. 286, no. 1-2, pp. 161-169, 2006.\par \par S. C.  Kumbharkar and Kharul, U. K., ?N-substitution of polybenzimidazoles: synthesis and evaluation of physical properties?, European Polymer Journal, vol. 45, no. 12, pp. 3363-3371, 2009.\par \par S. C.  Kumbharkar and Kharul, U. K., ?Investigation of gas permeation properties of systematically modified polybenzimidazoles by N-substitution?, Journal of Membrane Science, vol. 357, no. 1-2, pp. 134-142, 2010.\par \par S. C.  Kumbharkar and Kharul, U. K., ?New N-substituted ABPBI: synthesis and evaluation of gas permeation properties?, Journal of Membrane Science, vol. 360, no. 1-2, pp. 418-425, 2010.\par \par R. S.  Bhavsar, Kumbharkar, S. C., and Kharul, U. K., ?Polymeric ionic liquids (PILs): effect of anion variation on their CO2 sorption?, Journal of Membrane Science, vol. 389, pp. 305-315, 2012.\par \par S. C.  Kumbharkar, Bhavsar, R. S., and Kharul, U. K., ?Film forming polymeric ionic liquids (PILs) based on polybenzimidazoles for CO2 separation?, RSC Advances, vol. 4, no. 9, pp. 4500-4503, 2014.\par \par R. S.  Bhavsar, Kumbharkar, S. C., and Kharul, U. K., ?Investigation of gas permeation properties of film forming polymeric ionic liquids (PILs) based on polybenzimidazoles?, Journal of Membrane Science, vol. 470, pp. 494-503, 2014.\par \par R. S.  Bhavsar, Kumbharkar, S. C., Rewar, A. S., and Kharul, U. K., ?Polybenzimidazole based film forming polymeric ionic liquids: synthesis and effects of cation-anion variation on their physical properties?, Polymer Chemistry, vol. 5, no. 13, pp. 4083-4096, 2014.\par \par }