Once the gel is destroyed, no immediate, re-gelation is observed as the system is cooled again. After this initial assessment, we investigated the effect of polymer concentration, chain length and chain termini as well as the reproducibility of the rheological properties between different polymer batches. Amplitude sweeps showed that at 5 wt.% and 5 °C, the polymer solutions of A-PPheOzi 15 -A (B1) represent a weak gel (G´~ 135 Pa). However, both storage and loss modulus could be greatly modulated by changing the polymer concentration. Increasing the concentration to 40 wt.% the stiffness of the gel increased four orders of magnitude (G´ (40 wt.%) ~ 110 kPa) whereas the regions of linear viscoelasticity decreased notably (Figure ).