Research Article
Evaluation of Some Conducting Polymers as Novel Antioxidants for Rubber Vulcanizates
Table 4
Rheometric characteristics and physico-mechanical properties of SBR vulcanizates containing the prepared homopolymers and copolymers.
| Property | Formulation no. | 1′ | 2′ | 3′ | 4′ | 5′ | 6′ | 7′ | 8′ | 9′ |
| Rheometric characteristics at °C | Minimum torque, , dN·m | 13 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 12 | Maximum torque, , dN·m | 65 | 69 | 65 | 74 | 72 | 79.5 | 71.5 | 69 | 69 | Optimum cure time, , min | 25 | 22.5 | 24 | 18 | 18 | 17 | 19 | 21 | 23 | Scorch time, , min | 5.5 | 5.0 | 6.0 | 4.0 | 4.0 | 3.0 | 4.5 | 5.5 | 5.5 | Cure rate index, CRT, min−1 | 5.13 | 5.71 | 5.56 | 7.14 | 7.14 | 7.14 | 6.9 | 6.45 | 5.71 |
| Physicomechanical properties at the optimum cure time | Stress at yield, , Pa | 15.28 | 17.2 | 17.58 | 24.4 | 22.35 | 26.12 | 21.8 | 19.5 | 18.86 | Stress at rupture, , MPa | 15.01 | 16.34 | 17.06 | 23.83 | 21.4 | 25.8 | 20.2 | 18.47 | 17.2 | Strain at yield, , % | 325 | 368 | 370 | 451 | 430 | 480 | 423 | 410 | 380 | Strain at rupture, , % | 338 | 372 | 375 | 460 | 444 | 483 | 420 | 417 | 383 | Equilibrium swelling, Q% | 335 | 318 | 283 | 240 | 251 | 234 | 259 | 268 | 275 |
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