Abstract
Temperature-induced degradation of nitrile butadiene rubber (NBR) can negatively affect its mechanical properties. Further improvement in the aging resistance of the elastomer is required in view of the stringent application requirements. Polyamide elastomers (PAE) were used as reinforcing agents of NBR to prepare NBR/PAE blend by physical blending. Interaction between NBR and PAE was investigated using FTIR, DMA, SEM and swelling test. After aging at 110 and 130 °C for 7 days, NBR/PAE blend exhibited the minimum change of tensile strength. The reason why NBR/PAE blend could maintain excellent tensile strength retention during thermo-oxidative aging was investigated. Finally, the swelling behavior of rubbers in biodiesel and IRM 903 was measured and validated in combination with the Hansen solubility parameter (HSP) method. FTIR and swelling mass changes were also used to explain the reduction of the mechanical properties of NBR/PAE blend in biodiesel. This work presents useful guidelines for the development of thermo-oxidative aging resistance rubber products.
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