The synthesis of telechelic ester-urethane macromonomer (PrZnAc) was performed in two steps based on our previous work . Briefly, in the first step, 25 g (0.013 mmol) of polyester polyol (Priplast 1838) was reacted with 6.5 ml (0.052 mmol) of IPDI by ZnAc catalyst (2 mol% calculated relative to amount of polyester polyol). In the second step, 6 mg (0.03 mmol) of phenothiazine (a polymerization inhibitor), a second aliquot of a catalyst (the same mol% as in first step), and 6.6 ml (0.054 mmol) of 2-hydroxyethyl methacrylate (HEMA) were introduced, while protecting the reaction from the light. Progress of the reaction was monitored by tracking the ratio between FT-IR absorbance at 2262 cm -1 (A2262), which corresponds to N=C=O vibration in isocyanate groups of IPDI, and at 1526 cm -1 (A1526), which corresponds to N-H bending vibrations of the formed urethane bonds. The macromonomer was then precipitated into four-fold excess of ice-cold methanol three times and any residual solvent was evaporated under reduced pressure at 50 °C.