Abstract A series of hyperbranched polymers with different contents of ureidopyrimidone(Upy) units were prepared by reacting hydroxyl terminated hyperbranched poly(amine-ester)(HPEA) with monoisocyanato methylisocytosine at —OH/—NCO ratios of 1∶0.13，1∶0.25，1∶0.33 and 1∶0.5，respectively.The melt rheology of the modified polymers was investigated by using a Physica MCR300 rheometer.Due to the formation of self-complementary quadruple hydrogen bonding of Upy groups

the modified polymers demonstrated strong temperature and frequency dependent characters in melt rheological properties

and the dissociation temperature appeared to increase as more Upy units existed in the samples.The results indicated that at the low frequency range

the complex viscosity decreased

the storage modulus became larger as increasing the frequency.However

at the high frequency range

the samples displayed shear-thickening behavior

and the storage modulus decreased sharply to rather low values as increasing the frequency.Meanwhile

the loss modulus seemed to increase as elevating the frequency at all frequency range.Such uncommon rheological performance could be explained based on the disruption of Upy micro-domains by shearing force and the formation of quadruple hydrogen bonds between the released Upy units.This investigation is helpful for understanding the rheological behavior of Upy contained polymers and designing new dynamic functional materials.