described previously. The initiator MeOTf was added to a dried and argon flushed flask and dissolved in the respective volume of sulfolane, followed by monomer addition. Subsequently, the reaction mixture was heated to 100 °C or 130 °C (according to the type of monomers, see SI). Reaction progress was controlled by 1 H-NMR spectroscopy. After complete consumption of monomer, additional monomer was added in case of block copolymer synthesis, or termination was carried out by addition of 1-Boc-piperazine (PipBoc) at 50 °C. Subsequently, K2CO3 was added, and the mixture was stirred at 50 °C. The crude product was purified by dialysis. For polymer synthesis details and characterization, see Fig. and Fig.