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As part of our endeavor to enhance the surface properties of honeycomb-like polymeric films (i.e.,tailored hydrophobicity/hydrophilicity and solvent-resistance),in this report we developed two novel reactive PU polymers:poly(urethane-co-acylurea) (PU-PACY) and polyurethane-co-azetidine-2,4-dione containing polyurethane (PU-PAZ).PU-PACY presenting pendent aromatic anhydride moieties was synthesized through carbodiimide (CDI) chemistry,which is used extensively in peptide synthesis.In esterification processes.the use of CDI chemistry is often hampered by a side reaction that converts carboxylic acids to N-acylureas.