02147nas a2200217   4500008004100000022001400041245014900055210006900204260007300273300001200346490000800358520126700366653001901633653001901652653002201671653003501693100002101728700002601749700002201775856013201797       2016                        eng d  a0376-738800aPolybenzimidazole based polymeric ionic liquids possessing partial ionic character: effects of anion exchange on their gas permeation properties0 aPolybenzimidazole based polymeric ionic liquids possessing parti  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcJAN  a282-2880 v4973 a<p>Polymeric ionic liquids (PILs) are emerging as promising membrane materials for CO2 separation. Present work is in continuation with our earlier efforts on evaluating gas permeation properties (especially, CO2) of film forming PILs based on polybenzimidazoles and efforts towards improving their permeability by structural tuning. This work specifically aims at evaluating effect of anion variation in chosen PILs possessing partial N-quaternization of imidazole moiety of PBI-Bul. Three anions (viz., Tf2N-, BF4- and Ac-) were chosen for the bromide exchange of two PILs, viz., [TBzPBI-Bul][Br](10) and [TBzPBI-Bul][Br](18), possessing degree of PEI N-quaternization (DQ) as 10 and 18%, respectively. Concurrent effects of variation in anion and DQ were analyzed in terms of physical and gas permeation properties of the resulting PILs. All of them possessed amorphous nature, adequate thermal stability ( &gt;= 250 degrees C) and solvent solubility, which are primary requisites towards their applicability as a membrane material. PILs possessing BF4- anion exhibited improved CO2 permeability coefficient as well as its permselectivity over CH4 and N-2, in comparison to their counterparts with other anions. (C) 2015 Elsevier B.V. All rights reserved.</p>10aAnion exchange10aGas separation10aPolybenzimidazole10aPolymeric ionic liquids (PILs)1 aRewar, Anita, S.1 aShaligram, Sayali, V.1 aKharul, Ulhas, K.  uhttps://library.ncl.res.in/content/polybenzimidazole-based-polymeric-ionic-liquids-possessing-partial-ionic-character-effects-1