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• W2965656397 abstract "Abstract Thermally rearranged (TR) polymers exhibited a good balance of high permeability and high selectivity. For this purpose HAB-6FDA polyimide was synthesized from 3,3 dihydroxy-4,4-diamino-biphenyl (HAB) and 2,2-bis-(3,4-dicarboxyphenyl) hexafluoro propane dianhydride (6FDA) by chemical imidization. Initially, the sample was modified from pure polymer to silica nanofiller doped polymer membrane. Further the modification was done by thermal rearrangement reaction at 350 °C temperature. This modification causes a mass loss in polymer structure and therefore enhances the fractional free volume (FFV). The gases used for the permeation test were H2, CO2, N2 and CH4. Selectivity was calculated for H2/CO2, H2/N2 and H2/CH4 gas pairs and plotted in the Robeson's 2008 upper bound and compared with reported data. The transport properties of these gases have been compared with the unmodified membrane. Permeability of all the gases has increased to that of unmodified polymer membrane. Thermally rearranged polymer nanocomposite exhibits higher gas permeability than that of silica doped and pure polymer. Also the selectivity for H2/CO2 and H2/N2 gas pairs exceeds towards Robeson's upper bound limit. It crosses this limit dramatically for H2/CH4 gas pair. Polymer nanocomposite can be utilized to obtain high purity hydrogen gas for refinery and petrochemical applications." @default.
• W2965656397 created "2019-08-13" @default.
• W2965656397 creator A5059043768 @default.
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• W2965656397 date "2020-07-01" @default.
• W2965656397 modified "2023-10-18" @default.
• W2965656397 title "Thermally rearranged (TR) HAB-6FDA nanocomposite membranes for hydrogen separation" @default.
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• W2965656397 doi "https://doi.org/10.1016/j.ijhydene.2019.07.052" @default.
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