Preparation and characterization of polyoxetane resins anchoring the pendant spacer-separated hydroxamic acid residue

Polyoxetane resins, IVa and IVb, anchoring the hydroxamic acid residue were prepared with high degree of functionality (DF) by polymer reactions from aliphatic NH, groups at pendant spacer-ends of IIa and Ilb. The pendant hyd roxamic acids adsorbed Cu(Ir) ions from aqueous solution of Cu(II) acetate at pH 6 to show capacity beyond that calculated for the ordinary Cu(II)-com plex chelated with the two pendant ligands, probably due to the formation o f uncompleted chelate structures. The corresponding aromatic NH, groups of IIe and III showed very low DF in the same polymer reactions. At pH 6, amin es of IIe and IId adsorbed Cu(II) ions to a certain extent, although those of IIa and Ilb could adsorb no Cu(II) ions. A soft, expansible polyoxetane network, as a supporting matrix, may importantly affect Cu(II)-adsorption a t high capacity.