Interfacial synthesis and properties of L-lysine-derived optically active poly(ester-imide)s

L-Lysine hydrochloride was transformed to ethyl L-lysine dihydrochloride.This salt was reacted with trimellitic anhydride to yield the corresponding diacid（1）.Intertacial polycondensation results novel poly（ester-imide）s(PEI_a-i).These polymers have inherent viscosities in the range of 0.23-0.47 dl g^-1,display optical activity,and are readily soluble in polar aprotic solvents.They start to decompose(T_10%) above 350℃and display glass-transition temperatures at 100.42-172.81℃.All of the above polymers were fully characterized by UV,FT-IR and ¹H NMR spectroscopy,elemental analysis,TGA,DSC,inherent viscosity measurement and specific rotation.