New Functional Maleimides and Citraconimides for Amide, Urea or Parabanic Aromatic Bismaleimides

New aromatic bismaleimides or biscitraconimides with amide or Urea groups were obtained fly the condensation reactions of corresponding isocyanates with benzoic acid N-substituted maleimides or citraconimides or water. By the cyclization of the resulting bisimides with oxalyl chloride, the new aromatic bismaleimides or biscitraconimides with parabanic groups were prepared. The structures of monomers were confirmed by IR, H-1-NMR and C-13-NMR spectroscopy. Thermal curing behavior of monomers was investigated by DSC and thermogravimetric analysis. (C) Koninklijke Brill NV. Leiden, 2008