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N1 and ΔN1 of LDH/NBR composites.
| Sample | Unmodified NBR | NBR/LDH–NO3 (5 phr) | NBR/LDH–SAS (1 phr) | NBR/LDH–SAS (3 phr) | NBR/LDH–SAS (5 phr) | NBR/LDH–SAS (7 phr) |
|---|---|---|---|---|---|---|
| Tg (°C) | −22.1 | −20.3 | −20.9 | −19.9 | −19.4 | −18.9 |
| E′AVG (MPa) | 2.25 | 3.50 | 3.00 | 4.32 | 4.78 | 3.89 |
| N1 (1014) | 1.92 | 2.99 | 2.56 | 3.69 | 4.08 | 3.32 |
| ΔN1 (1014) | 0 | 1.07 | 0.64 | 1.77 | 2.16 | 1.40 |
N1: the number of network chains per unit volume of rubber; ΔN1: the difference in the number of network chains between NBR/LDH composites and unmodified NBR.
