(661f) Synthesis and Characterization of Modified Polysulfones for Gas Separation Applications | AIChE

(661f) Synthesis and Characterization of Modified Polysulfones for Gas Separation Applications

Authors 

Camacho-Zuñiga, C. - Presenter, Universidad Iberoamericana
Ruiz-Treviño, F. A. - Presenter, Universidad Iberoamericana


Structure/property relationships are exhaustively studied as a way to design materials with better permeability-selectivity properties and therefore to increase the applications of gas separation technologies. Many works focused in this address have lead to new materials with exceptional gas separation properties. In fact, a previous job has shown that an alternative to increase selectivity of a bisphenol-A polysulfone, BPA, with very small losses in permeability is achieved by introducing compact and rigid connectors as 1,1 bi-2-naphtol, BN2. Whereas it has also been shown that its permeability increases by incorporating polar and bulky connectors like tetrametilhexafluoro bisphenol A, TMHFBPA2, at expenses of barely significant losses in selectivity. The aim of this job is to analyze the effect on thermal, volumetric and gas transport properties of the simultaneous presence of two different substituents with this characteristics. It presents a series of modified polysulfones copolymers that were synthesized by polycondensation in solution. The structures resulted from the polymerization of two diols with an acid group (4,4'-difluoro biphenyl sulfone). Such diols were added in equimolar proportion and they included either hexafluro bisphenol A (HFBPA), tetrametil bisphenol A (TMBPA), or tetrametilhexafluoro bisphenol A (TMHFBPA); while the second diol being dihidroxinaphtalen (N). The resultant polysulfones formed clear films from solution cast, and they were characterized by FTIR, intrinsic viscosity, DSC, TGA, specific volume and gas transport properties to H2, O2, N2, CH4 and CO2.

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