Synthesis and characterisation of bis(4-maleimidophenyl) sulphone (B) and its Michael adducts E and F, prepared by reacting 1 mol of B with 0.33 mols of 4,4'-diaminodiphenyl ether and 9,9-bis(4-aminophenyl) fluorene is described. Curing characteristics of these resins and bis(4-allyl nadicimidophenyl) methane (S) and 1,6- diallylnadicimidohexane (V) were studied in static air atmosphere by differential scanning calorimetery. Curing temperatures depended on the structures of the resins and highest curing temperatures were observed in S and V samples. Thermal behavior of blends of B, E, and F with S and V resins was studied as a function of blends composition. Thermogravimetric analysis of cured resin blends showed an improvement in thermal stability.