To explore the effect of added graphene sheets (GNs) and added perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) on the tribological and mechanical performances of polyimide (PI) matrix, GNs and PTCDA reinforced PI-based composites were synthesized via the blending method. The tribological properties of GNs/PTCDA/PI (GAPI) composites with different weight ratios of GNs and PTCDA under dry sliding, deionized water lubrication, and kerosene lubrication were comparatively investigated. A synergism was found between GNs and PTCDA; this synergism endowed filled PI composites with a lower friction coefficient and showed an improved wear rate under different lubrication conditions, especially when the weight ratio of GNs and PTCDA was 1:1 (GAPI-1). Under dry sliding, deionized water lubrication, and kerosene lubrication, the friction coefficient of GAPI-1 composites decreased by 41.1%, 70%, and 35.7%, respectively, while the wear rate decreased by 39%, 50%, and 25.1%, respectively. Meanwhile, the tensile strength, tensile modulus, and the elongation at break of GAPI-1 films increased by 40.8%, 51.3%, and 49.2%, respectively, relative to those of pure PI. We anticipate that this work can be used to exploit a simple and effective method for preparing materials for bearings and transmission parts that possess good tribological properties under harsh lubrication conditions.

中文翻译：

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通过掺入功能化石墨烯改善聚酰亚胺复合材料的摩擦学和机械性能

为了探索添加石墨烯片 (GNs) 和添加苝-3,4,9,10-四羧酸二酐 (PTCDA) 对聚酰亚胺 (PI) 基体的摩擦学和机械性能的影响，GNs 和 PTCDA 增强的 PI 基复合材料进行了研究。通过混合方法合成。比较不同GNs和PTCDA重量比的GNs/PTCDA/PI(GAPI)复合材料在干滑动、去离子水润滑和煤油润滑下的摩擦学性能。在 GNs 和 PTCDA 之间发现了协同作用；这种协同作用赋予填充 PI 复合材料更低的摩擦系数，并在不同润滑条件下显示出更高的磨损率，尤其是当 GNs 和 PTCDA 的重量比为 1:1 (GAPI-1) 时。在干滑动、去离子水润滑和煤油润滑下，GAPI-1复合材料的摩擦系数分别下降了41.1%、70%和35.7%，磨损率分别下降了39%、50%和25.1%。同时，GAPI-1 薄膜的拉伸强度、拉伸模量和断裂伸长率分别比纯 PI 提高了 40.8%、51.3% 和 49.2%。我们预计这项工作可用于开发一种简单有效的方法来制备轴承和传动部件材料，这些材料在恶劣的润滑条件下具有良好的摩擦学性能。相对于纯 PI 的那些。我们预计这项工作可用于开发一种简单有效的方法来制备轴承和传动部件材料，这些材料在恶劣的润滑条件下具有良好的摩擦学性能。相对于纯 PI 的那些。我们预计这项工作可用于开发一种简单有效的方法来制备轴承和传动部件材料，这些材料在恶劣的润滑条件下具有良好的摩擦学性能。