2-ureido-4［1H］-pyrimidone (Upy) telechelic hyperbranched polymers were prepared and their coating performances were investigated.First

a secondary amine terminated hyperbranched poly(ester-amine) (HPEA) was prepared from piperazine and trimethylolpropanetriacrylate at secondary amine/acrylate group ratio of 2.25/1.At secondary amine/isocyanate stoichiometric ratios of 1∶0.3

1∶0.4 and 1∶0.5

HPEA was further reacted with monoisocyanato methylisocytosine to give three modified hyperbranched polymers bearing terminal Upy units.Based on the 1H-NMR spectra of the modified polymers

the degree of modification was calculated

which agreed well with the feeding composition of the components.Due to the formation of self-complementary quadruple hydrogen bonding of Upy groups

the Upy modified polymers possessed improved glass transition temperature (Tg) and decomposing temperature (Td) compared to HPEA.The coating materials of the modified polymers displayed good mechanical properties.The Tg

Td and coating hardness became higher as increasing the Upy content.All the coatings possessed impact strength of 0.5 kg·m and flexibility of grade 7.This investigation demonstrated that hyperbranched polymers with improved performances could be obtained via incorporating strong hydrogen bonding

which is helpful for designing new dynamic materials.