Abstract In this work, hybrid phase and blend phase composed of carbon nanotube (CNT) and fluorinated graphene (FG) were doped into pure polyimide via a solution doping method to improve the tribological properties of polyimide. The effect of the hybrid phase and blend phase on mechanical and tribological properties of polyimide (PI) composite coatings were systematically investigated. The results showed that there was a much stronger interfacial interaction to enhance the mechanical properties of PI composite coating modified by the blend phase. The tensile strength increased by 46 %, hardness increased by 43 %, and storage modulus increased by 96 % at room temperature. The significantly enhanced mechanical properties can provide plenty of energy to resist wear for PI composite coating, and thus resulting in a 61 % reduction in wear rate. In addition, due to the lubricating properties imparted by the hybrid phase, the coefficient of friction (COF) of PI composite coating modified by hybrid phase was reduced by 13 %, showing the best anti-friction performance.

中文翻译：

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含碳纳米管和含氟石墨烯的混合相或共混相聚酰亚胺复合涂层的摩擦学行为

摘要 本工作通过溶液掺杂法将碳纳米管（CNT）和氟化石墨烯（FG）组成的混合相和共混相掺杂到纯聚酰亚胺中，以提高聚酰亚胺的摩擦学性能。系统研究了混合相和共混相对聚酰亚胺 (PI) 复合涂层机械和摩擦学性能的影响。结果表明，存在更强的界面相互作用来提高共混相改性的 PI 复合涂层的机械性能。在室温下，拉伸强度增加了 46%，硬度增加了 43%，储能模量增加了 96%。显着增强的机械性能可以为 PI 复合涂层提供充足的抗磨损能量，从而使磨损率降低 61%。