The synthesis of CN2-1 in THF (ϕ = 0.06) is described in the following as an example: To start the cross-linking, 0.972 g of the stock solution of 5 was placed in a 5 mL reaction flask equipped with a flat stirrer using a 1 mL syringe. Then, 0.784 g of the stock solution of 3 was added, and the reaction flask was tightly closed. The reaction mixture was stirred at 25 °C until gelation was observed. After this, the reaction flask was placed in a preheated oil bath (40 °C) for three days. ). The assignments are in accordance with data reported in our recent study on soluble tetraarm polymers containing the same structural motif. A part of the analysis (rheology, NMR) requires a modified preparation that is explained in the corresponding sections below.