Y. Mansoori, Mina Ghanbari
Jun 1, 2015
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0
Influential Citations
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Journal
Polymers for Advanced Technologies
Abstract
Novel, thermally stable polyimides (PIs) containing a 1,3,4-oxadiazole and pyridine moieties based on a new aromatic diamine 2,5-bis-(aminopyridine-2-yl)-1,3,4-oxadiazole, BAPO, were synthesized. The prepared polymers were soluble in dimethysulfoxide (DMSO) and concentrated sulfuric acid at room temperature as well as in polar and aprotic solvents, such as, N-methylpyrrolidone (NMP) and N,N-dimethylacetamide (DMAc) at elevated temperature. Thermal behaviors of the PIs were studied by thermogravimetric analysis/dynamic thermal analysis (TGA-DTA) and differential scanning calorimetry (DSC). The inherent viscosities of the PI solutions were in the range of 0.38–0.61 dl/g (in DMSO with a concentration of 0.125 g/dl at 25 ± 0.5°C). The removal of Co(II) and Ni(II) ions from aqueous solutions was performed using polymer 6, which was obtained from BAPO and 3,3′,4,4′-benzophenonetetracarboxylic dianhydride (BTDA). The maximum adsorption capacity was observed for Co(II) ion at pH = 7.0 (110.4 mg g−1, 1.87 mmol g−1). Copyright © 2015 John Wiley & Sons, Ltd.