Filler hybridisation in elastomers has become a subject of both scientific and industrial interest. Consequently, the use of nanofillers has attracted researchers looking to enhance the performance of elastomers. Therefore, carboxyl graphene (CG) and silicon dioxide (SiO₂) nanofillers have been hybridised for the combined effect study of composite NBR (acrylonitrile butadiene rubber) elastomers in various accelerated environmental ageing conditions (high temperature, low temperature, and QUV). The inorganic filler (SiO₂) had enhanced dispersion upon hybridising with CG on the surface of a composite NBR elastomer. To evaluate the mechanical and dynamic mechanical properties, unfilled and filled (CG/SiO₂) composite NBR elastomer samples were prepared by mixing and rolling methods. Furthermore, the prepared samples were kept in various ageing chambers. The results of mechanical testing exhibited that tensile strength improvement was greater for filled elastomers than unfilled elastomers after ageing. Moreover, the filled elastomers were also able to retain the reduction in elongation at break after ageing. However, after ageing, the hardness of composite NBR elastomers increased marginally with the addition of CG/SiO₂. Moreover, the loss factor (tan δ) of a composite NBR elastomer (CG/SiO₂: 15/7.5), compared to that of the unfilled NBR elastomer before and after ageing, decreased but was still much higher than that of the aged unfilled NBR elastomer. The reason behind that was that CG/SiO₂ dispersion in the composite NBR elastomer matrix acted as a barrier against ageing. CG/SiO₂ hybridising is an effective way to develop high-performance composite NBR elastomers with good potential in industrial applications.

Graphical abstract

中文翻译：

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羧基石墨烯与二氧化硅纳米填料对环境老化复合丁腈橡胶的杂化效果

弹性体中的填料杂化已成为科学和工业界关注的主题。因此，纳米填料的使用吸引了寻求增强弹性体性能的研究人员。因此，将羧基石墨烯（CG）和二氧化硅（SiO ₂）纳米填料混合用于复合NBR（丁腈橡胶）弹性体在各种加速环境老化条件（高温、低温和QUV）下的综合效应研究。无机填料(SiO ₂ )与复合NBR弹性体表面的CG杂化后分散性增强。评估未填充和填充的机械和动态机械性能 (CG/SiO ₂)采用混炼、压延的方法制备复合NBR弹性体样品。此外，将制备的样品保存在各种老化室中。机械测试结果表明，老化后填充弹性体的拉伸强度比未填充弹性体的改善更大。此外，填充弹性体还能够在老化后保持断裂伸长率的降低。_{然而，老化后，随着CG/SiO 2}的添加，复合NBR弹性体的硬度略有增加。此外，复合NBR弹性体(CG/SiO ₂：15/7.5），与老化前后的未填充NBR弹性体相比，有所下降，但仍远高于老化后未填充NBR弹性体。其背后的原因是复合 NBR 弹性体基体中的 CG/SiO ₂分散体起到了防止老化的屏障作用。CG/SiO ₂杂化是开发高性能复合NBR弹性体的有效途径，具有良好的工业应用潜力。

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