ISSN   1004-0595

CN  62-1224/O4

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李东伟, 段春俭, 高传平, 王超, 张晟卯, 张平余, 王齐华, 王廷梅. 基础油分子结构对多孔聚酰亚胺含油特性及两者复合体系润滑机理的影响[J]. 摩擦学学报(中英文), 2025, 45(3): 1−15. DOI: 10.16078/j.tribology.2023288
引用本文: 李东伟, 段春俭, 高传平, 王超, 张晟卯, 张平余, 王齐华, 王廷梅. 基础油分子结构对多孔聚酰亚胺含油特性及两者复合体系润滑机理的影响[J]. 摩擦学学报(中英文), 2025, 45(3): 1−15. DOI: 10.16078/j.tribology.2023288
LI Dongwei, DUAN Chunjian, GAO Chuanping, WANG Chao, ZHANG Shengmao, ZHANG Pingyu, WANG Qihua, WANG Tingmei. Research on the Effect of the Molecular Structure of Base Oils on Porous Polyimide with Different Performances of Oil Absorption and Lubrication[J]. Tribology, 2025, 45(3): 1−15. DOI: 10.16078/j.tribology.2023288
Citation: LI Dongwei, DUAN Chunjian, GAO Chuanping, WANG Chao, ZHANG Shengmao, ZHANG Pingyu, WANG Qihua, WANG Tingmei. Research on the Effect of the Molecular Structure of Base Oils on Porous Polyimide with Different Performances of Oil Absorption and Lubrication[J]. Tribology, 2025, 45(3): 1−15. DOI: 10.16078/j.tribology.2023288

基础油分子结构对多孔聚酰亚胺含油特性及两者复合体系润滑机理的影响

Research on the Effect of the Molecular Structure of Base Oils on Porous Polyimide with Different Performances of Oil Absorption and Lubrication

  • 摘要: 利用已成熟的造孔工艺,制备得到了具有一定孔径(1.46 μm)和孔隙率(22.63%)的多孔聚酰亚胺材料(PPI). 选择3种不同极性与黏度的基础油,通过探究基础油极性与PPI含油特性与外界刺激响应行为,揭示了基础油的分子结构与PPI含油特性和刺激响应行为的内在关联. 同时,以含不同基础油的PPI为摩擦材料样品,通过改变载荷和速度的方式,实现多孔含油PPI的刺激响应,进而起到润滑的效果. 通过探究不同结构基础油的响应润滑行为,分析磨损之后的形貌和组成结构,阐明了不同极性基础油的润滑机制,预期试验结果对多孔含油自润滑材料的设计提供重要参考.

     

    Abstract: Oil-containing porous polyimide (OPPI) with excellent mechanical strength and high-temperature resistance,is normally used as a bearing retainer in certain conditions. The main mechanism of lubrication is primarily based on its internal porous structure, which can provide durable lubrication through the release and re-absorption of stored lubrication oils. Therefore, oil content and oil retention, which are both determined by the porous structure of polyimide have a heavy influence on their long-term lubrication. However, there is a holdback to obtaining OPPI with both higher porosity and smaller pore size according to the present method by cold-pressing and hot sintering. To break through this limitation, researchers have conducted various attempts including design with different molecular structures of polyimide, adjusting internal pore size, and optimizing the lubricants. However, it is easy to ignore the interaction between different base oils and PPI molecular structure, but particularly crucial to oil absorption and release. As well we know, there is a lack of systematic investigations into this field. In this work, we prepared and obtained porous YS-20 (PPI) with a certain pore size (1.46 μm) and porosity (22.63%) by utilizing an established pore-making process. We investigated the effects of the molecular structure of the base oils on the capacity of oil storage and recyclable smart-lubrication of porous YS-20. Three base oils (PAO10, DIOS, PEG400) with different polarity and viscosity were selected. The intrinsic correlation between the molecular structure of the base oil on the oil-containing characteristics and stimulus-response behavior of the porous YS-20 was revealed. The higher polarity base oil PEG400 was found to greatly improve the oil content and oil retention of porous YS-20. Herein, QCM-D was further used to characterize the adsorption properties between YS-20 and different structural base oils, revealing the intrinsic connection between them. It was found that the adsorption of PEG400 on the surface of YS-20 was stronger and the adsorption film was thicker compared with that of PAO10 and DIOS. At the same time, porous YS-20 containing different base oils was used as the friction material to realize the stimulation response of the porous oil-containing polyimide material by varying the load and speed, thus providing a lubrication effect. Porous YS-20 impregnated with PEG400 was found to have excellent friction reduction and anti-wear properties. By characterizing and analyzing the morphology and composition of porous YS-20 and steel ring wear surfaces after friction experiments, the intrinsic lubrication mechanism of porous YS-20 impregnated with base oils of different polarities was elucidated. In conclusion, this study could provide some theoretical support for the design of porous polyimide self-lubricating materials for future high-end equipment.

     

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