Table 4.
Tensile properties of TPU-(PCL-b-PEG-b-PCL) multi-block copolymers in the dry and in the wet state. (n = 5, average ± SD).
| PEG/PCL | Water Uptake | E | σmax | ɛbreak | σyield | ɛyield | Wtensile | |
|---|---|---|---|---|---|---|---|---|
| (mol/mol) | (wt.%) | (MPa) | (MPa) | (%) | (MPa) | (%) | (N/mm2) | |
| TPU-(PCL3-PEG14-PCL3) | 70.2/29.8 | dry | 100 ± 15 | 6.1 ± 0.4 | 1080 ± 242 | 3.7 ± 0.5 | 5.1 ± 0.2 | 6244 ± 725 |
| TPU-(PCL5-PEG10-PCL5) | 49.8/50.2 | dry | 176 ± 16 | 8 ± 2 | 766 ± 282 | 7.5 ± 1 | 3.2 ± 0.6 | 5865 ± 3224 |
| TPU-(PCL7-PEG6-PCL7) | 29.5/70.5 | dry | 103 ± 16 | 15 ± 7 | 1566 ± 326 | 6.9 ± 0.6 | 6.1 ± 0.8 | 21841 ± 8667 |
| TPU-(PCL3-PEG14-PCL3) a | 70.2/29.8 | soluble | - | - | - | - | - | - |
| TPU-(PCL5-PEG10-PCL5) | 49.8/50.2 | 534 | 7 ± 2 | 4 ± 1 | 147 ± 41 | 3.0 ± 0.6 | 3.0 ± 0.5 | 513 ± 267 |
| TPU-(PCL7-PEG6-PCL7) | 29.5/70.5 | 122 | 52 ± 10 | 17 ± 2 | 1553 ± 155 | 7.3 ± 0.7 | 13 ± 2 | 17976 ± 3011 |
a Soluble in water.