A quantitative test of the above computations is possible with dynamic light scattering (DLS), since the hydrodynamic radius can be measured by this method. The DLS correlation functions of 3 and 5 in THF at 25 and 35 °C are depicted in Figure . The data of 5 show two distinct relaxation modes, indicating the formation of aggregates. This was accounted for by considering two independent decays for the data analysis, see the SI Chapter 7 for a detailed description. The key result of this analysis is the hydrodynamic radius of both compounds (the data of 5 also contain an estimate for the cluster size) that is provided in the inset of Figure . Using 𝜒 𝜂 and the computation of 𝑅 𝑔 and 𝑅 ℎ above provides 𝑅 ℎ = 2.8 ± 0.2 for compound 3 in perfect agreement with the DLS data. The same computation for compound 5 leads to a significantly smaller 𝑅 ℎ = 2.4 ± 0.2 reproducing the trend of the viscosity measurements, while the DLS data refer to an enlarged estimate for 𝑅 ℎ . Apparently, the dynamics of individual stars interferes here with the dynamics of the clusters. However, the physical origin for the clustering is not clear and might be related to the differences in the oxygens between both polymers, which seems to be essential for the significant difference in the interaction parameter. Altogether, the agreement for compound 3 strongly supports our analysis, suggesting that there are no large collective shifts to be expected on an absolute scale for our set of interaction parameters. Furthermore, a concentration of 70 g L -1 is sufficient for all three solvents to assure overlap of the star polymers. Therefore, this concentration is generally used as a benchmark for networks prepared at or above the overlap concentration 𝑐 * . .