The molar mass of the copolymer was monitored during the copolymerisation using SEC (Figure S1a & S1b). A linear increase in the molar mass with monomer conversion was observed indicating a controlled polymerisation. Polymerisation control was further confirmed through the monomodal mass distribution (Figure ) and low dispersities (Ð < 1.25, Figure ) observed over the course of the copolymerisation. Finally, a reduction in the yellow colour of the reaction mixture was witnessed during the copolymerisation corresponding to the consumption of the DOT monomer (Figure ).