Title of article :
Hydrogen separation and purification in membranes of miscible polymer blends with interpenetration networks
Author/Authors :
Hosseini، نويسنده , , Seyed Saeid and Teoh، نويسنده , , May May and Chung، نويسنده , , Tai Shung، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2008
Pages :
10
From page :
1594
To page :
1603
Abstract :
This study demonstrates the successful implications of blending technique cum chemical modification for the fabrication of high performance polymeric membranes for gas separation applications. The effect of variation in composition on miscibility and microstructure, gas permeability and selectivity of blend membranes is investigated. It is found that augmentation in PBI composition results in enhancement in gas separation performance of membranes which is attributed mainly to the effect of diffusivity selectivity. Analysis of the microstructure of membranes confirms the variations in chain packing density, d-spacing and segmental mobility of polymer chains as a result of blending. Separation performance of membranes is further ameliorated through chemical modification of blend constituents. Modification of PBI phase with p-xylene dichloride brings about slight improvements in selectivity performance, especially for H2/CO2 and H2/N2. In contrast, the selectivity of membranes is improved significantly after cross-linking of Matrimid phase with p-xylene diamine. The results indicate that higher tendency of Matrimid toward cross-linking reaction contributes more in controlling the transport properties of membranes through diffusion coefficient by increase in chain packing density and diminishing the excess free volumes. Results obtained in this study reveal the promising features of developed membranes for gas separation applications with great potential for hydrogen separation and purification on industrial scale.
Keywords :
polybenzimidazole , polymer blending , Hydrogen separation
Journal title :
Polymer
Serial Year :
2008
Journal title :
Polymer
Record number :
1731439
Link To Document :
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