Synthesis and characterization of some epoxy resins bearing azomethine groups

Abstract New epoxy resins bearing azomethine groups were synthesized by the reaction between the diglycidyl ether of bisphenol-A (DGEBA) and some aromatic azomethines, in the presence of n -butylamine as catalyst. The azomethines were obtained through the condensation reaction of aromatic diamines with 2-hydroxybenzaldehyde. The epoxides synthesized at 100 °C were characterized by i.r., u.v. and 1 H-NMR spectral techniques, as well as by DSC and TG thermoanalytical methods. Some other properties of the resins are presented, such as epoxy equivalent, melting points and nitrogen content. The epoxy resins containing azomethine groups show an apparent higher thermal stability than that of crude DGEBA epoxy resin, and some of them show a pronounced tendency towards crystallization.