Development of green and dark blue colors in epoxy resins cured with 4,4′‐diaminodiphenylmethane

摘要

AbstractFrom a study of the oxidation of bisphenol‐A epoxy resin cured with DDM (4,4′‐diaminodiphenylmethane), it has been shown that the development of greenish‐blue colors is due to an initial reaction between molecular oxygen and secondary amine groups. A full reaction scheme is suggested and supporting evidence, in the form of UV/visible, infrared, and ESR spectra, is pr