SYNTHESIS AND CHARACTERIZATION OF SOME EPOXY-RESINS BEARING AZOMETHINE GROUPS

New epoxy resins bearing azomethine groups were synthesized by the rea ction between the diglycidyl ether of bisphenol-A (DGEBA) and some aro matic azomethines, in the presence of n-butylamine as catalyst. The az omethines were obtained through the condensation reaction of aromatic diamines with 2-hydroxybenzaldehyde. The epoxides synthesized at 100 d egrees C were characterized by i.r., u.v. and H-1-NMR spectral techniq ues, as well as by DSC and TG thermoanalytical methods. Some other pro perties of the resins are presented, such as epoxy equivalent, melting points and nitrogen content. The epoxy resins containing azomethine g roups show an apparent higher thermal stability than that of crude DGE BA epoxy resin, and some of them show a pronounced tendency towards cr ystallization. (C) 1996 Elsevier Science Ltd