Table 3.
Curing parameters and Wolff activity coefficient determined for NR–CNF composites.
| Properties | NR-Gum | NR–CNF 1 phr | NR–CNF 2 phr | NR–CNF 3 phr | NR–CNF 4 phr |
|---|---|---|---|---|---|
| Scorch time, ts2(min) | 2.49 | 3.27 | 3.26 | 3.25 | 3.07 |
| Optimum cure time, t90(min) | 7.42 | 8.16 | 8.16 | 8.42 | 8.19 |
| Cure rate index (min−1) | 20.28 | 20.44 | 20.40 | 19.34 | 19.76 |
| Minimum torque(ML, dNm) | 0.15 | 0.20 | 0.20 | 0.25 | 0.16 |
| Maximum torque(MH, dNm) | 6.71 | 6.96 | 7.24 | 7.47 | 7.31 |
| Differential torque, MH–ML (dNm) | 6.56 | 6.76 | 7.04 | 7.22 | 7.15 |
| Wolff activity coefficient | - | 3.04 | 3.65 | 3.35 | 2.24 |