Facile and Rapid Synthesis of Novel Optically Active Poly(amide-imide-urethanejs Derived from Bis(p-amido benzoic acid)-N trimellitylimido-Ldeucine and Polyoxyethyl ene-MDI under Microwave Irradiation.

Anew class of optically active poly(amide-imide-urethane)s (PAIUs) was synthesized via one-step diisocyanate route under microwave irradiation. 4,4 -methylenebis-(4-phenylisocyanate) (MDI) was reacted with bis(p-amido benzoic acid)-Ntrimellitylimido-L-Ieucine (BPABTL) and polyethyleneglycol-diols (PEG)s to furnish a series of new PAIUs. The effect of different reaction conditions such as irradiation power, irradiation time, reaction solvent, soft segment length, and reaction catalysts as well as no catalyst condition were investigated. Also, the possibility of the synthesis of modified thermoplastic polyether urethanes by introducing the imide and amide functions in the polyurethane (PU) backbone was explored. The resulting multiblock copolymers have inherent viscosities in the range of 0.09-0.63 dUg. These copolymers are optically active, thermally stable and soluble in amide-type solvents.