Hydrogel G’(MPa) G’’(MPa) γcr(%) PVA 9% 88 ± 8 3.3 ± 0.3 3.8 ± 0.4 PVA 9%-CSA 1% 88 ± 8 3.5 ± 0.1 3.4 ± 0.7 PVA 9%-CSA 2% 93 ± 9 4.4 ± 0.2 4.5 ± 0.8 PVA 9%-HA 1% 124 ± 8 4.9 ± 0.5 2.9 ± 0.4 PVA 9%-HA 2% 128 ± 40 8.2 ± 0.4 1.1 ± 0.1

Table 1: Mechanical Analysis of PVA based hydrogels. In particular the tables reported young’s modulus (storage and loss modulus G'e G'') and critical strains (γcr). Rheological parameters determined for PVA and CS containing hydrogels resulted not significantly different (p > 0.05).