For example, D'hooge and Barner-Kowollik illustrated the strength of semi-batch addition for precision polymer synthesis for Passerini multicomponent polymerization. Complementary, van Herk and coworkers 20 used this approach to overcome the non-favorable reactivity ratios between cyclic ketene acetals (CKAs) and acrylate derivatives, to prepare polymers with high monomer conversion without a substantial compositional drift.