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Tensile Behavior after Oxidative Aging of Gum and Black-Filled Vulcanizates of SBR and NR
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1999
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EngineeringMechanical EngineeringTensile BehaviorStyrene-butadiene RubberOxidative AgingThermoplastic CompositeSoft MatterPolymersPolymer MaterialPolymer ProcessingRheologyPolymer CompositesPolymer ChemistryMaterials SciencePolymer StabilityPolymer BlendPolymer EngineeringProlonged AgingNatural RubberMechanical PropertiesPolymer ScienceWood FibreBlack-filled Vulcanizates
Abstract Typical sulfur-cured vulcanizates of styrene-butadiene rubber (SBR) and natural rubber (NR) were prepared, and subjected to air-oven aging at 100 °C. Gum specimens exhibited an initial aging period in which stiffness was unchanged, while tensile strength and strain-to-break were significantly reduced. In contrast, black-filled vulcanizates stiffened during early aging. After intermediate aging times, NR specimens softened, while SBR stiffened. With prolonged aging, all compositions became hard and inextensible.