pMeOx-b-pBuOzi-b-pMeOx (A-BuOzi-A) were synthesized via living cationic ring opening polymerization (Figure ). The synthesis procedure can be found elsewhere and in the Supporting Information (Supporting Information Table -S8, Figure ). As the hydrophilic block is the same in all studied polymers, it will be abbreviated with A. The polymers were characterized by H NMR spectroscopy and SEC (Table ). The molecular weights determined by H NMR are in accordance with the theoretical calculated values, whereas the values determined by SEC are overestimated, due to the PMMA calibration used.