Wittmer, Izu et al., and Kruger et al. have presented copolymer equations that describe the general equilibrium copolymerization model shown in Scheme 1; however, we have found critical errors in the equations derived by Wittmer and Izu et al. and present rectified forms of their equations here (see the Equilibrium Copolymer Equations Section of the Supporting Information for details). These errors likely explain previous observations of instability during evaluation of the Wittmer equations. Although these three copolymer equations are derived using different approaches and appear in disparate forms, we find that they are consistent with each other and provide practically indistinguishable results when evaluated with the same parameters (Figures ). Considering this agreement, for this work we choose to present in the main text and use for evaluation only the model as derived by Izu and coworkers due to its more intuitive parameter assignment and simpler form, which appears as a traditional copolymer equation differential for relative monomer consumption (Eqn. 10) in addition to four coupled algebraic equations (Eqns.