Vulcanizing and mechanical properties of the SSBR composites filled with different ratios of silica/CB103.
| SiO2/CB in parts per hundred (phr) | |||||
|---|---|---|---|---|---|
| Testing items | 0/70 | 20/50 | 35/35 | 50/20 | 70/0 |
| t 10 (min) | 5 | 4.2 | 4.4 | 4.3 | 4.5 |
| t 90 (min) | 8.3 | 8.2 | 9.2 | 11 | 17.1 |
| Shore A hardness | 68 | 68 | 65 | 65 | 64 |
| Modulus at 300% (MPa) | 11.6 | 18.3 | 15.6 | 15.1 | 12.8 |
| Tensile strength (MPa) | 17.3 | 22.8 | 22.2 | 21.5 | 20.3 |
| Elongation at break (%) | 356 | 378 | 409 | 454 | 402 |
| Tear strength (kNm−1) | 46.6 | 48.1 | 57.9 | 50.7 | 46.9 |
| Dynamic compression heat buildup (°C) | 20.1 | 16.9 | 16.7 | 15.5 | 10.7 |