Abstract
AbstractPolyurethanes 6 and 7 based on poly(oxyethylene) (5) were synthesized and investigated for the application as macromolecular chelating agents. 4,4′‐Diaminobenzil (3c) and 4,4′‐diaminobenzil monoxime (4a) were prepared as monomer precursors in 70 and 80% yield. Copolymers were obtained in yields between 40 and 60% by polyaddition of the corresponding diisocyanates 3d and 4b to poly(oxyethylene) (5) of different chain length and characterized by IR and 13C NMR spectroscopy. The application of the resulting polyurethanes containing functional aromatic block units as polychelatogenes was studied in homogeneous phase by membrane filtration. The metal content was determined in both the filtrate and the retentate and in the case of Ni2+ at different pH values. At pH 2, for example, the molar binding capacity of a polyurethane sample of 6 was 3 times as high as that of 5.
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