Synthesis and Characterization of Novel Optically Active Poly(ether-urethane)s Modified by Copoly(amide-imide) Segments based on Amino Acid through Diisocyanate Route: Influence of Reaction Parameters

In connection with our interest in preparing thermally stable optically active polymers, this work deals with a detailed study on the synthesis and characterization of three series of novel optically active poly(ether-urethane)s (PEU)s based on polytetrahydrofuran (PTHF), polyoxyethylene (POE) and polypropyleneglycole (PPG). Also the possibility of their thermal modification by introducing the imide and amide functions in the PEU backbone through the reaction of a new imide containing diacid, bis(p-amido benzoic acid)-N-trimellitylim ido-L-leucine (BPABTIL) (1) with 4,4 -methylene-bis-(4 -phenylisocyanate) (MOl) (2) was explored. The effect of different reaction conditions such as reaction temperature, reaction time, catalysts, reaction solvent, soft segment length and type, method of preparation and addition of chain extender on the properties of copolymers including solubility, viscosity and thermal behaviours were investigated.