Table 4. Cell Structure Details and Compressive Strength of Standard and Toughened PFs.
| cell size (μm) | cell wall thickness (μm) | compressive strength (KPa) | |
|---|---|---|---|
| PF | 60.63 ± 22 | 16.37 ± 8 | 130 ± 3.6 |
| PF-Li | 87.51 ± 45 | 13.39 ± 9 | 174 ± 0.2 |
| PF-SS | 52.72 ± 18 | 19.97 ± 5 | 198 ± 1.4 |
| PF-NC | 52.3 ± 22 | 16.15 ± 5 | 175 ± 1.8 |
| PF-U | 58.07 ± 19 | 14.95 ± 4 | 144 ± 2.5 |