Table 2. Mechanical Properties of Porous and Freeze–Thawed Sacran Hydrogelsa.
| porous
hydrogels |
freeze–thawed hydrogels |
|||||||
|---|---|---|---|---|---|---|---|---|
| cross-linking temperaturesb (°C) | Ec (kPa) | σd (kPa) | εe (mm/mm) | strain-energy densityf (kJ/m3) | Ec (kPa) | σd (kPa) | εe (mm/mm) | strain-energy densityf (kJ/m3) |
| 60 | 3 ± 1 (18 ± 5) | 1 ± 0.1 (7 ± 1) | 0.60 ± 0.06 | 0.3 ± 0.1 (1 ± 0.2) | 5 ± 0.2 | 2 ± 1 | 0.65 ± 0.09 | 1 ± 0.1 |
| 80 | 5 ± 1 (19 ± 3) | 5 ± 1 (17 ± 3) | 0.94 ± 0.47 | 1 ± 0.1 (4 ± 2) | 46 ± 6 | 28 ± 9 | 0.74 ± 0.33 | 13 ± 5 |
| 100 | 21 ± 5 (62 ± 16) | 13 ± 3 (38 ± 8) | 0.88 ± 0.19 | 10 ± 4 (19 ± 11) | 250 ± 37 | 120 ± 18 | 0.75 ± 0.02 | 52 ± 12 |
| 120 | 220 ± 410 (540 ± 98) | 210 ± 44 (520 ± 110) | 1.46 ± 0.32 | 91 ± 7 (550 ± 140) | 610 ± 50 | 330 ± 40 | 0.68 ± 0.14 | 140 ± 13 |
| 140 | 590 ± 130 (1360 ± 290) | 200 ± 30 (470 ± 70) | 0.40 ± 0.09 | 43 ± 12 (120 ± 11) | 1750 ± 430 | 760 ± 40 | 0.52 ± 0.08 | 210 ± 32 |
a
Mechanical properties were determined from stress–strain curves recorded at room temperature using a tensiometer in an elongation mode. Values in parentheses are mechanical properties reestimated using matrix cross-sectional areas by subtracting pore areas.
b
Thermal-cross-linking temperatures of layered film as precursors of layered hydrogels.
c
E values refer to elastic modulus.
d
σ values refer to tensile strength at fracture.
e
ε values refer to elongation at fracture.
f
Strain-energy-density values were estimated from area surrounded by stress–strain curves.