For further investigation on factors influencing the microstructure of our amphiphilic PEG-PCL co-networks, sample series with different parameter variations (see Table ) were synthesized for checking the influence of (i) network composition (PEG-PCL co-network vs. PEG-PEG network with benzoxazinone/amino end groups), (ii) solvent and (iii) temperature programs during synthesis. Aspect (i) is also addressed in Figure , whereas Figure shows the rest of the results. (i): The most fundamental difference between our networks and a PEG-PEG gel is the fact that we have stars made of different polymers. The interaction parameters in Table show that no miscibility problems should arise related to the polymers. Moreover, for PEG-2, synthesized by the oxazinone coupling reaction referred to above, the same qualitative trend of a decreased SL fraction (in comparison to the data by Lange et al. ) was found (see Figure ), ruling out the polymers as source of this discrepancy. Still, we find a slight quantitative increase in the estimated fraction of single links from 35 % to 41 % on going from ACN to homo-PEG gel, although the actual polymer fraction upon synthesis was even slightly lower for the latter. We want to remind here that although this trend is within the shown error bars, the error bars are to be seen as systematic deviations arising from a slight unambiguity in the used fit function, meaning that if the upper boundary is chosen for the PEG-PCL network, it also has to be chosen for the PEG-PEG network (see Experimental Section and Figure ).