Frequency sweeps corroborated a strong viscoelastic-solid behavior over a large range of frequencies and concentrations (Figure ). Apart from changing the hydrophobic core with respect to the chemical structure of the repeat unit, the amphiphilic ratio was adjusted by varying the degree of polymerization within the hydrophobic core resulting in A-PPheOzi 5 -A, A-PPheOzi 15 -A and A-PPheOzi 30 -A. In addition, several batches of A-PPheOzi 15 -A were synthesized to assess batch-to-batch reproducibility of the viscoelastic properties of the polymers. The rheological properties of all four batches of A-PPheOzi 15 -A are quite similar showing a prominent gel-like character (G´> G´´) at 15 wt.% aqueous solutions at 5 °C with storage moduli around 10 kPa (Figure ). Similar properties were also found in cell culture medium (Figure ). Unexpectedly, the gel strength decreased significantly when increasing the degree of polymerization of the central hydrophobic block to 30 units with a concomitant increase of the linear viscoelastic region (Figure a, black ￭, see also Figure ). Decreasing the chain length to 5 units of the PPheOzi-block completely prevented gel formation in the investigated concentration range. At 10 wt.% the gel formed by A-PPheOzi 30 -A was comparable to a 5 wt.% gel of A-PPheOzi 15 -A. For solutions of A-PPheOzi 15 -A at 5 °C and a 15 wt.%, the frequency had only minor effect on the viscoelastic properties of the gel. The gel character remained unchanged within the investigated frequency range up to 500 rad/s. This corroborates that the physical network is thoroughly developed and surprisingly stable in the entire frequency range investigated. On the other hand, the strongly decreasing complex viscosity values over several orders of magnitude show profound non-Newtonian fluid behavior. Well defined yield-and flow-points are beneficial properties for hydrogels when used in the field of biofabrication and 3D printing (Figure ). Moreover, pronounced shear thinning (Figure ) and rapid structure recovery (Figure ) are desired and realized by the novel materials. In literature, different experiments, namely the steady stress sweep (Figure ) and the dynamic oscillatory stress sweep (Figure ), are discussed to obtain the yield-and flow-point of a system direct from the plotted values.