Table 2 The curing and mechanical properties of the pure nano silica-NBR samples.

From: Synthesis of vinyl-based silica nanoparticles by sol–gel method and their influences on network microstructure and dynamic mechanical properties of nitrile rubber nanocomposites

Sample

R-ctrl

R-NP1

R-NP2

R-NP3

R-NP5

R-NP10

Cure time (t90, min)

4.145

4.35

4.432

4.324

3.961

4.42

∆M = MH − ML (dN m)

11.599

11.355

10.867

12.943

12.51

12.52

TS2 (min)

1.67

1.93

2.162

2.045

2.049

2.228

CRI

40.402

45.035

44.592

43.893

52.302

46.675

Tensile strength (MPa) (± SD)

13.91 ± 0.3

13.81 ± 0.5

13.83 ± 0.6

14.3 ± 0.65

14.7 ± 0.65

13.45 ± 0.7

Elongation at break (%) (± SD)

369.36 ± 3

393.07 ± 5

397.67 ± 5.7

400.64 ± 5.8

367 ± 5.7

400.8 ± 6.5

Modulus at 100% (MPa)

3.07

2.67

2.8

2.34

2.51

2.9

Modulus at 300% (MPa)

11.66

10.65

10.3

10.7

12.2

10.22

Reinforcement index

3.79

3.98

3.67

4.57

4.86

3.52

Hardness (Shore A)(± SD)

79 ± 0.5

75 ± 2

77 ± 2

78 ± 2

79 ± 2

81 ± 2

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