Ebrahim Abouzari-Lotf - Novel polyoxadiazoles with non-coplanar ortho-linked structures as highly CO2 permselective membranes

Document created by Ebrahim Abouzari-Lotf on Aug 13, 2015
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  Abouzari-Lotf, E., Shockravi, A., Rafieimanesh, A., Saremi, M.,   Javadi, A., Nasef, M.M. 4 (35) 17993-18002

  Abstract: A novel class of polyoxadiazole   membranes containing non-coplanar 1,1′-thiobis(2-naphthoxy)   (S-BINOL) groups was synthesized using a versatile route and   tested for CO2 separation. Dihydrazide monomer was obtained in a   two-step high-yielding procedure and used in polycondensation   reaction with terephthaloyl chloride to prepare a polyhydrazide,   which was converted into amorphous and soluble polyoxadiazoles   having an inherent viscosity of around 1 dL g-1 by a simple   thermal cyclization without using any solvent or in solvent   cyclization. The ortho-linked sulfide groups of the obtained   polymers were subsequently oxidized to yield sulfone-containing   polymers. Polyoxadiazole membranes demonstrated comparable CO2   separation properties to those of imide based polymers and almost   better performance than commercial and modified   polyethersulfones, and the previously reported polyoxadiazoles.   The sulfone-containing polyoxadiazole membranes exhibited higher   permeability, lower selectivity, and enhanced plasticization   pressure compared to the corresponding sulfide containing ones. ©   2014 The Partner Organisations.

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