The Michael addition reaction of N, N′-ethylene bismaleimide (EBM) and 4,4′-diamino diphenyl methane (DDM) at 1:1, 1:1.5, and 1:2 molar ratios was carried out in melt at 125–130°C. The resultant oligoimides (EBM–DDM) were characterized by elemental analysis, number of amino and imino groups, IR spectral studies, number-average molecular weight estimated by nonaqueous conductometric titration, and thermogravimetry. These oligoimides were used to cure an epoxy resin, the diglycidyl ether of bisphenol-A, and studied by differential scanning calorimetry (DSC). The unreinforced EBM–DDM-epoxycured products have also been prepared and characterized.
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Patel et al. (1995) studied this question.
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