Preparation and characterization of polyoxetane resins having aspartic acid moiety and its derivatives at the spacer-separated side-chain end

The pendant spacer-separated aliphatic primary amines of polyoxetane resins were modified by polymer reactions to give chelate resins bearing N-spacer -substituted aspartic and its hydroxamic acid moieties. The primary amines of polyoxetane resins were subjected to the Michael addition with diethyl m aleate to a degree of functionality of 0.6 similar to 0.9, and the resultan t aspartates were then converted to the acid moieties by alkali-hydrolysis or NH2OH-aminolysis. The corresponding anilino pendants also gave the Micha el addition products, as confirmed by their IR spectra, although a model pr oduct was not obtained. The Cu(II)-adsorption capacities of the acid-contai ning aliphatic amino-type resins were 2.9 similar to 3.8 mmol g(-1), which were higher than the capacity expected for the ordinary structure of a Cu(I I) ion chelated with two molecules of carboxylic or hydroxamic acids, being ascribed to the expansibility of a polyoxetane network and the hydrophilic ity of the pendant acids.