Synergistic effects of carbon nanotubes and carbon black on the fracture and fatigue resistance of natural rubber composites |
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| Authors: | Bin Dong Chang Liu Yonglai Lu Youping Wu |
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| Affiliation: | 1. State Key Laboratory of Organic–Inorganic Composites, Beijing University of Chemical Technology, Beijing, China;2. Beijing Engineering Research Center of Advanced Elastomers, Beijing University of Chemical Technology, Beijing, China |
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| Abstract: | The quasi‐static fracture and dynamic fatigue behaviors of natural rubber composites reinforced with hybrid carbon nanotube bundles (CNTBs) and carbon black (CB) at similar hardness values were investigated on the basis of fracture mechanical methods. Mechanical measurement and J‐integral tests were carried out to characterize the quasi‐static fracture resistance. Dynamic fatigue tests were performed under cyclic constant strain conditions with single‐edged notched test pieces. The results indicate that synergistic effects between CNTBs and CB on the mechanical properties, fracture, and fatigue resistance were obtained. The composite reinforced with 3‐phr CNTBs displayed the strongest fatigue resistance. The synergistic mechanisms and dominating factors of quasi‐static and dynamic failure, such as the dispersion state of nanotubes, hybrid filler network structure, strain‐induced crystallization, tearing energy input, and viscoelastic hysteresis loss, were examined. The weakest fatigue resistance of the composite filled with 5‐phr CNTBs was ascribed to its strikingly high hysteresis, which resulted in marked heat generation under dynamic fatigue conditions. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42075. |
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| Keywords: | composites graphene and fullerenes mechanical properties nanotubes rubber |
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