Abstract:
4,4-Dihydroxysaltrien zinc and nickel complexes (MSalOH[subscript 2] trien, where M = Zn and Ni) were synthesized from the reaction between 2,4-dihydroxybenzaldehyde, metal (II) acetate and triethylenetetramine at the mole ratio of 2:1:1. These metal complexes were characterized by IR, [superscript 1]H NMR[superscript 13]C NMR spectroscopy and elemental analysis. The metal complexes were used for the synthesis of polyurethane-ureas and copolyurethane-ureas. Polyurethane-ureas were synthesized from the polymerization reaction of MSalOH[subscript 2]trien with different diisocyanates, namely 4,4-diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPD), poly(1,4-butanediol) toluene-2,4-diidocyanate terminated prepolymer (MW 900, PB) and poly(propylene glycol) toluene-2,4-dissocyanate terminated prepolymer (MW 1000, PP). Copolyurethane-ureas were synthesiszed by polymerization reaction between MSalOH[subscript 2]trien, MDI and m-xylylenediamine. Metal-containing polymers were characterized by IR, NMR, elemental analysis, solubility and viscometry. Their thermal properties were studied by thermogravimetric analysis (TGA). Flammability of polymers was measured by limiting oxygen index (LOI). It was found that nickel-containing polymers show higher thermal stability than zinc-containing polymers. Thermal stability of copolyurethane-ureas was improved upon the addition of m-xylylenediamine in the polymerization.