In order to obtain urethane telechelic macromonomers, IPDI was used. This asymmetric cycloaliphatic diisocyanate is expanding the use in numerous synthetic routs mainly due to presence of primary and secondary isocyanate groups, where the secondary cycloaliphatic group is more reactive than the primary aliphatic group . In the urethane formation reaction, the relative reactivity of the isocyanate groups of IPDI depends on the catalyst type, the diol/polyol chemistry, and the reaction temperature used. Catalysis by Lewis acids (such as DBTDL) boosts the secondary isocyanate group reactivity, for the case of Lewis base (such as DABCO) primary isocyanate group becomes slightly more reactive, leading to similar reactivity of both NCO groups . Additionally, increasing the steric hindrance of the molecules containing hydroxyl groups favors formation of primary urethanes.