Modification of existing polymers leads to enhancement of many desirable, properties. So, a hyperbranched polyurethane (HBPU) of monoglyceride of Mesua ferrea L. seed oil, poly(epsilon-caprolactone)diol (M-n = 3000; mol (1)), 2,4-toluene diisocyanate, and glycerol with 30%, hard segment (NCO/OH = 0.96) has been modified with different amounts of bisphenol-A based epoxy resin. The system is Cured by poly(amido amine) hardener at 120 degrees C for specified period of time. Improvement of thermostability, scratch hardness, and impact strength are observed by this modification of HBPU. The differential scanning calorimetry (DSC) results, Show improvement of melting temperature of the modified systems. The enhancement of tensile strength is about 2.4 times compared with that of the unmodified one. The morphology and structural changes due to variation of epoxy content Was Studied by scanning electron microscopy (SEM) analysis and Fourier transform infrared (FTIR) spectroscopy. The rheological properties of the epoxy-modified HBPU show the dependence on the amount of epoxy resin. Shape memory Study of the crosslinked HBPUs shows 90-98% thermoresponsive shape recovery. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 116: 106-115, 2010