SYNTHESIS AND CHARACTERIZATION OF BISMALE IMIDES AND POLYASPARTIMIDES CONTAINING PYRIMIDINE/DITHIANE MOITIES

Bismaleimides containing pyrimidine and dithiane group were synthesized from the diamines APPB and APDB and maleic anhydride via bismaleiamic acid as the intermediate followed by cyclodehydration . The structure of the monomers was confirmed by FT - IR, 1 H - NMR and 13 C - NMR spectral techniques. Further, a s eries of polyaspartimides were synthesized by addition reaction of bismaleimides with the prepared diamines. The polymers were characterized by using FT - IR, 1 H - NMR and 13 C - NMR. All the polymers are soluble in aprotic solvents such as NMP, DMF, DMAc and DM SO. The activation energies (E a ) of the thermal curing were calculated using Ozawa and Kissinger method from DSC (E a 103 KJ/mol and 106 KJ/mol ). The T g and T 10 % of the polyaspartimides are in the range of 199 - 2 80 o C and 3 60 - 48 o C respectively .