Abstract
The photooxidation of 19 epoxy-amine networks is studied by IR and UV spectrophotometry. The main changes result from the oxidative attack of aliphatic segments; the groups in the β or γ position relative to nitrogen lead to carbonyls, whereas those in the α position lead to amides. The bisphenol moiety of diepoxides is mainly involved in initiation. The amide yield essentially depends on α-aminomethylene concentration and on electron density on nitrogen which governs the hydrogen abstraction on neighbouring methylenes. At least three kinds of chromophores are formed, they result from the oxidation of, respectively, bisphenol moiety, amine and, when present, the bridge of the methylene dianiline moiety.
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