**3.3. Thermal gravimetric analysis**

Thermogravimetric (TGA) measurements were performed with a TGA Q5000 instrument. The samples were heated, in nitrogen atmosphere 10 ml/min with a rate of 10°C/min.

The isotherms of equilibrium swollen hydrogel disks were carried at 37°C for 10 mL/min in nitrogen atmosphere. All experiments were realized in triplicate.
