Abstract
The degradation behaviors of nitrile rubber O-rings immersed in hydraulic oil were investigated by adopting the artificial accelerated aging test. The chemical structures and mechanical properties of the aged samples under different conditions were evaluated by measuring the attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, crosslinking density, weight loss, mechanical properties and fracture morphology. The ATR-FTIR results indicate that the amide groups and the hydroxyl groups were formed in the surface of the aged samples. The changes in the crosslinking density of the samples attributed to the competition between crosslinking and chain scission. The mechanical test results show that the tensile strength of samples immersion in oil changed remarkably for the different temperatures. In addition, the fracture morphology results demonstrate that the formation of the defects also led to the decrease in properties of the aged samples.
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