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Thermoelastic Effect of Vulcanized NBR Loaded by HAF Carbon Black |
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PP: 37-43 |
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Author(s) |
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G. M. Nasr,
Sh. A. Mansour,
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Abstract |
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| The acrylonitrile butadiene rubber (NBR) loaded by various amounts from high abrasion furnace (HAF) carbon black were fabricated using melt blending technique. The influence of dynamic cyclic elongation on the thermoelastic effect of HAF/NBR samples has been studied with different stain amplitude reached to 100%. The effect of period of the dynamic cyclic stress on the thermoelastic behavior of NBR composites was thoroughly studied. All the tested samples exhibited the same thermoelastic behavior. The generated heat during cycling was promoted the formation of free radicals which are set in random motion. Such motion caused the initial increase in temperature. On the other hand, the carbon black aggregates are aligned in a direction parallel to the applied stress, giving small rise in the temperature change of a sample due to the nearing between the particles of filler. The effect of HAF-content (in NBR) on the thermoelastic behavior was investigated. The change in entropy Δs and internal energy ΔU with dynamic strain could be calculated as a function of HAF-black and strain amplitude. |
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