For the production of heat-resistant epoxyimide oligomers with high physicochemical properties, it is of practical interest to modify bisphenol-A epoxy resins with diimides of aromatic acids [1, 2]. The high activity of epoxy groups in epoxy-bisphenol A resins in relation to different proton donors makes it possible to introduce imide groups into them. After appropriate curing, both by epoxy groups and by hydroxyl groups formed as a result of the reaction, ordered structures with the prescribed properties are formed. The present paper gives the results of the modifi cation of epoxy resin ED-20 with imides of 2-sulphoterephthalic acid (I) and 4-sulphoisophthalic acid (II) below. The interaction of epoxy resin with modifi ers I and II, depending on their ratios, proceeds by the COOH and by the NH group respectively, with the formation of monoepoxide (III) and diepoxide (IV) as shown.
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