Figure 2: CFD simulation results for the modified reactor geometry with the redesigned stirrer lens. From left to right, the figure shows the temperature distribution T , the normalized decomposed initiator fraction α_Initiator of TBPA, TBPEH, and TBPND along the x-position, the spatial distribution of monomer con- version X, and the normalized polymer fraction α_Polymer along the x-position. Compared to the original geometry, the redesigned stirrer lens strongly sup- presses back-mixing from the reaction chamber toward the inlet region. As a result, the temperature increase between the stirrer shaft and the stirrer lens is reduced, initiator decomposition is shifted into the reactor chamber and polymer is no longer transported back toward the inlet region.