Synthesis and characterization of Schiff base metal complexes and reactivity studies with maleimide epoxy resin

A novel maleimide epoxy contg. Co(II)​, Ni(II)​, and Cu(II) ions have been synthesized by curing a maleimide epoxy resin (MIEB-​13) with Co(II)​, Ni(II)​, and Cu(II) complexes of a macrocyclic bis-​hydrazone Schiff base. The Schiff base was synthesized by reacting terephthaloyl dihydrazide with 2,​6-​diformyl-​4-​methylphenol. The Schiff base and its Co(II)​, Ni(II)​, and Cu(II) complexes have been characterized by elemental analyses, spectral (IR, 1H NMR, UV-​vis., FAB mass, ESR)​, thermal, and magnetic data. The curing reaction of the epoxy resin was carried out with the metal complex crosslinking agents. The stability of the cured samples was studied by thermogravimetric analyses; the products have excellent chem. (acid​/alkali​/solvent) and water absorption resistance. Further, SEM and DSC techniques confirmed the phase homogeneity of the cured systems