The relative decrease of Mn is thus more important for a terpolymerization using PhMal than MA (Figure vs Figure ), showing that the propagation rate coefficients seem more appropriate in the case of maleimide derivatives. Nevertheless, the Mn of the degraded product is not in agreement with the amount of DOT added; assuming equal monomer distances one would expect a much lower Mn of 2,000-2,500 g•mol -1 . Hence, also for the maleimide-based system model-based design is recommended to tune the polymerization conditions. reported that DOT incorporation is more important than the acrylate derivative for DOT ending radicals, suggesting a rDOT higher than 1. Since the rDOT value is of paramount importance for our model-based design, we first reinvestigated the copolymerization of DOT and MA and determined reactivity ratios, using the Skeist equation and Nonlinear Least-Squares (NLSS) fitting (see Supporting Information). Molar reed ratios [MA]0:[DOT]0 of 95:5, 80:20 and 50:50 have been used and the conversion of both comonomers was determined by 1 H NMR. The polymerization is slower with an increasing initial amount of DOT, with only 30 % of monomer conversion for the initial feed ratio of 50:50 and even absence of polymerization for higher contents of DOT. Nevertheless, it was possible to determine the reactivity ratios as rDOT = 1.6 and rMA = 0.2 (Figure ), that overall are thus consistent with literature data.