Synthesis of metal-containing polyurethane-ureas from 4,4'-dihydroxysaltrien metal complexes

Abstract

4,4'-Dihydroxysaltrien metal complexes (ML, where M = Zn and Ni) were synthesized and used for the synthesis of polyurethane-ureas and copolyurethane-ureas containing 4,4'-dihydroxysaltrien metal complexes in polymer chain. The metal complexes were synthesized from the reaction between 2,4-dihydroxybenzaldehyde, triethylenetetramine and metal acetates (Zn and Ni). The metal complexes were then subjected to polymerization reaction with prepolymers, namely poly(l,4- butanediol)toluene-2,4-diisocyanate terminated prepolymer (MW 900, PB900) and poly(propylene glycol)toluene-2,4-diisocyanate terminated prepolymer (MW 1000, PP1000). The progress of polymerization reaction was monitored using infrared spectroscopy. The disappearance of isocyanate peak at 2270 cm-1 was observed when the polymerization was completed. Copolyurethane-ureas were synthesized by polymerization between ML, PB900 or PP1000 and xylylenediamine. Characterizations of polymers were carried out using FTIR spectroscopy and solubility. The polymers property investigated was their thermal stability which was studied by thermogravimetric analysis (TGA). It was found that nickel-containing polymers show higher thermal stability than zinc-containing polymers. The ML content was found to have influence on thermal property of metal-containing copolyurethane-ureas.