Polymerization of bismaleimide and maleimide monomers catalyzed by nanometer sized Na+/TiO2

The polymerization of a bismaleimide (BMID) monomer and five N-substituted maleimide monomers have been carried out in N,N-dimethyl formamide (DMF) at 155±2°C, initiated by nanometer sized Na+/TiO2. The polymer of BMID can also be prepared, with nanometer sized Na+/TiO2 as the initiator, in dimethyl sulfoxide (DMSO), cyclohexanone and epoxy chloropropane, but not in toluene. The structures and thermal properties of the resulting polymers were characterized by FT-IR, 1H-NMR, UV–VIS spectrophotometer and TGA, etc.