Table 1.
Experimental data of macroindentation tests on the 6 PAA hydrogels. D is measured for one indentation picture. ENH-fhd is calculated for a minimum of 10 measurements made on the same gel and ΔE represents the standard deviation.
| Hydrogel | *A/BA%wt | Indenter | δ/h min | δ/h max | ENH-fdh (kPa) | ΔENH-fdh (kPa) |
|---|---|---|---|---|---|---|
| PAA1 | 4/0.03 | SP | 0.195 | 0.227 | 0.14 | 0.01 |
| PAA2 | 4/0.06 | SS | 0.240 | 0.274 | 1.30 | 0.09 |
| PAA3 | 4/0.1 | SS | 0.157 | 0.194 | 2.69 | 0.24 |
| PAA4 | 5/0.15 | SS | 0.073 | 0.089 | 9.58 | 0.88 |
| PAA5 | 5/0.225 | SI | 0.314 | 0.364 | 11.86 | 0.97 |
| PAA6 | 8/0.48 | SI | 0.115 | 0.150 | 56.37 | 8.15 |
*In this column the wt% of the two monomers are reported. A represent the monofunctional acrylates Acrylamide and BA the bifunctional Bis-acrylamide. For PAA-OH gels, A represent the sum of the monofunctional acrylates Acrylamide and N-hydroxyethyl acrylamide (HEA). The amount of HEA is fixed at 1 mM. Sphere radius (R) and indentation force (F) are reported in Table SI.