, where [M]:[CTA] defines the DP), 4 mL of 1,4-dioxane, and a stir bar were added to a 20 mL scintillation vial. The vial was sealed with a rubber septum and the solution was purged with N 2 (g) for ~20-30 min in an ice bath to prevent solvent and monomer evaporation (PEGMA solutions were bubbled in cool water to prevent PEG crystallization). Subsequently, the vial was placed in a thermostated aluminum reaction block at 60 °C on top of a magnetic stir/hot plate. The reaction was left to stir overnight, yielding a viscous liquid. The solution was removed from heat and exposed to air to terminate the polymerization. The solution was precipitated into cold (-20 °C) ether, the solid washed twice more with cold ether, and dried at 0.01 mbar overnight.