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- W2126123414 abstract "Abstract Microporous polybenzimidazole of 250–500 μm spherical bead size from Celanese has been reacted with epichlorohydrin and sodium hydroxide and the resulting product with pendant epoxy groups has been reacted with various chelating ligands in order to augment the metal sorption capacity and selectivity of the resin. The chelating ligands used include ethylenediamine, diethylenetriamine, diethanolamine, dimethylglyoxime, L ‐cysteine, thiourea, dithiooxamide, glyoxal‐bis‐2‐hydroxyanil, salicylaldehyde‐ethylenediimine, and glyoxal‐bis‐2‐mercaptoanil. The aminolysis of the pendant epoxy groups with the oligoamines has been performed in pyridine under reflux conditions, while the addition reactions with the other ligands which are alkali soluble have been carried out at room temperature in a mixture of dioxane and aqueous KOH using tetra‐ n ‐butylammonium iodide as the phase transfer catalyst. The products are found to possess high capacity and selectivity in metal sorption depending on the ligand attached." @default.
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- W2126123414 date "1989-09-01" @default.
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- W2126123414 title "Attaching chelating ligands to polybenzimidazole via epoxidation to obtain metal selective sorbents" @default.
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- W2126123414 doi "https://doi.org/10.1002/pola.1989.080271005" @default.
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