Molecular dynamics study on the mechanical and tribological properties of polyimide reinforced by lanthana. Issue 10 (3rd November 2021)

• Record Type: Journal Article
• Authors: Cai, Peng; Xu, Chengpeng; Zheng, Fei; Song, Jingfu; Zhao, Gai
• Is Part Of: Industrial lubrication and tribology. Volume 73:Issue 10(2021)
• Page Start: 1319
• Page End: 1324
• Publication Date: 2021-11-03
• Subjects: Friction -- Molecular dynamics simulation -- Polyimide -- Rare earth oxide; Lubrication and lubricants -- Periodicals; Tribology -- Periodicals; 621.89
• DOI: 10.1108/ILT-08-2021-0309
• Languages: English
• ISSNs: 0036-8792

Abstract

Abstract : Purpose: The purpose of this paper is to investigate the effect of lanthana (La2 O3 ) on the mechanical and tribological properties of polyimide (PI). Design/methodology/approach: The mechanical and tribological properties of PI nanocomposites filled with La2 O3 were studied by molecular dynamic simulations to explore the deep mechanisms from an atomic or molecular view. Findings: The results showed that the hardness of the PI matrix increased after La2 O3 modification with a decrease of 72.4% nanoindentation depth. Besides, the friction coefficient of PI decreased by 72.2% after filling La2 O3, and the shear deformation was largely reduced under the same conditions. The adsorption effect of La2 O3 on the PI molecular, which reduced the atomic relative concentration, velocity, interaction with counterpart Fe layer and the temperature rise in the frictional interface, contributed to the improvement of the mechanical and tribological performance. Originality/value: This study reveals the friction and wear mechanism of PI composites filled with rare earth oxide at the nanoscale.