The Michael addition reaction of N,N′-benzidine bismaleimide (BBM) with 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 (BBM-DDM) were characterized by elemental analysis, number of amino and imino groups, IR spectral studies, number average molecular weight, by non-aqueous conductometric titration and thermogravimetry. These oligoimide were used to cure epoxy resin, namely diglycidyl ether of bisphenol-A and studied by differential scanning calorimetry (DSC). The unreinforced BBM-DDM-epoxy cured products have also been prepared and characterized.
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Patel et al. (1994) studied this question.
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