Synthesis and characterization of novel optically active poly(ester-imide-imine)s

N, N'-(3,3', 4,4'-Benzophenonetetracarboxylic)-3,3', 4,4'-diimido-di-L-amino acids (1a-1d) and N,N'-pyromelliticdiimido-di-L-amino acids (2a-2d) are prepared from the reaction of 3,3', 4,4'-benzenetetracarboxylic-3,3', 4,4'-dianhydride or pyromellitic dianhydride with the corresponding L-amino acids in a solution of glacial acetic acid/pyridine (3:2) at refluxing temperature. 4-(4-((4-Hydroxyphenylimino)methyl) benzylidene amino) phenol (3) is prepared from 4-amino phenol and terephthaldialdehyde in refluxing ethanol. Interfacial polycondensation method was used to prepare the corresponding polymers (PEII(1-8)) in two immiscible solvents (water/dichloromethane). The resulting poly(ester-imideimine)s (PEIIs) having good inherent viscosities (0.13-1.25 dl g(-1)), optical activity and thermal stabilities is obtained in high yields.