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Enhanced Gas Transport Performance of Polyamide Membranes by Postpolymerization Modification
- González-Díaz, Maria Ortencia, Sulub-Sulub, Rita, Herrera-Kao, Wilberth, Vázquez-Torres, Humberto, Zolotukhin, Mikhail G., Aguilar-Vega, Manuel
- Industrial & engineering chemistry process design and development 2018 v.57 no.27 pp. 8989-8996
- carbon dioxide, hydrogen, mechanical properties, methane, nitrogen, permeability, polyamides, process design, thermal stability
- A novel series of aromatic polyamides was synthesized by postpolymerization modification using a simple strategy to introduce different bulky pendant groups into a precursor polymer. The polyamides possess high thermostability with Tg values in the range of 298–312 °C and good mechanical properties. These polyamide membranes also exhibit enhanced gas separation performance, especially for CO₂ and H₂ separations, with plasticization resistance in the range tested (2.02–10.13 bar). The most remarkable result for gas permeability is attained with P3 bearing 4-tert-butylbenzoyl (TBB) as pendant group (PCO₂ = 88.1, PH₂ = 101 with selectivity (α) for CO₂/CH₄ = 19.2 and H₂/N₂ = 21.5). The highest permselectivity is obtained for P2 containing p-toluoyl (p-T) as pendant group (CO₂/CH₄ = 26.1 and H₂/CH₄ = 38.1).