Tribological properties of oil-impregnated porous polyimide modified by rare-earth compounds

IF 2 3区材料科学 Q2 ENGINEERING, MECHANICAL

Surface Topography: Metrology and Properties Pub Date : 2023-08-09 DOI:10.1088/2051-672X/acee9b

Li Liu, Jinyang Liu, Shunli Yin, Kaiwen Li, Lichen Hua, Ning-ning Zhou, Xudong Hu, Jinbang Li

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Abstract

Porous polyimide (PPI) exhibits good tribological performances due to excellent oil-storage properties. Porous structure could store lubricant but also make PPI materials difficult to be strengthened by most fillers, because fillers will destroy the pore structure and reduce the strength significantly. Rare-earth compounds (RECs) have high surface activity, which allow them to bond well with polymer. In this study, the tribological properties of REC modified PPIs were investigated using a ball-on-disc tribometer, along with an analysis of oil-impregnated properties, including oil content, oil retention, oil contact angle and oil absorption speed. The mechanical properties, including hardness (Shore D), impact strength and tensile strength, were tested to evaluate the effect of RECs. The results show that CeF3 and LaF3 fillers can lead to an increase of about 40% in oil content of PPI. PrF3 modified PPI were found to have better oleophilic properties, as the oil contact angle reduced 33% compared with pure PPI and oil retention could reach 88% after 120 min centrifugation. Moreover, PrF3 can enhance the surface hardness, impact strength and wear resistance performance of PPI despite a slight decrease in tensile strength. Better oil-impregnation and mechanical properties of PPI modified by PrF3 effectively reduce the friction and wear.

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稀土改性油浸多孔聚酰亚胺的摩擦学性能

多孔聚酰亚胺(PPI)具有优异的储油性能，具有良好的摩擦学性能。多孔结构可以储存润滑剂，但也使PPI材料难以被大多数填料强化，因为填料会破坏孔隙结构，显著降低强度。稀土化合物(RECs)具有很高的表面活性，这使得它们能够很好地与聚合物结合。在这项研究中，使用球盘式摩擦计研究了REC改性PPIs的摩擦学性能，并分析了油浸性能，包括含油量、油潴留、油接触角和吸油速度。通过硬度(Shore D)、冲击强度和拉伸强度等力学性能测试来评价RECs的效果。结果表明，CeF3和LaF3填料可使PPI含油量提高约40%。经PrF3改性后的PPI具有更好的亲油性能，与纯PPI相比，其油接触角减小33%，离心120 min后，保油率可达88%。此外，PrF3可以提高PPI的表面硬度、冲击强度和耐磨性，但拉伸强度略有下降。PrF3改性后的PPI具有更好的油浸性和力学性能，有效地降低了摩擦磨损。

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来源期刊

Surface Topography: Metrology and Properties Materials Science-Materials Chemistry

CiteScore

4.10

自引率

22.20%

发文量

183

期刊介绍： An international forum for academics, industrialists and engineers to publish the latest research in surface topography measurement and characterisation, instrumentation development and the properties of surfaces.