1. Effect of thermal oxidative ageing on the molecular structure and tribological properties of polytetrafluoroethylene.
- Author
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Qu, Fan, Liu, Lian, Tao, Guanyu, Zhan, Wen, Zhan, Shengpeng, Li, Yinhua, Li, Changchun, Lv, Xikun, Shi, Zhimin, and Duan, Haitao
- Subjects
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POLYTEF , *MOLECULAR structure , *MOLECULAR spectroscopy , *SLIDING friction , *MOLECULAR dynamics , *MECHANICAL wear - Abstract
Polytetrafluoroethylene (PTFE), which has an extremely low coefficient of friction and good thermal and chemical stability, is widely used as a self-lubricating material. In this study, the thermal oxidative-ageing mechanisms of PTFE were studied using infrared spectroscopy and molecular dynamics simulations, and the influence of the thermal oxidative-ageing time on its tribological properties was investigated under a high load (20 MPa). Results indicated that thermal oxidative-ageing resulted in oxidation fracture, generating CF 2 O products, followed by further oxidation to CFO 2 as ageing time increased. The dynamic friction coefficient of PTFE fluctuated significantly under heavy load, and its wear rate fluctuated over a small range but showed a decreasing trend with increased ageing. [Display omitted] • Thermal oxidative-aging mechanisms of PTFE are evaluated experimentally. • Molecular dynamics simulations predict thermal oxidative aging of PTFE with time. • Tribological properties under high load are affected by thermal oxidative aging. • The dynamic friction coefficient of PTFE fluctuates significantly under heavy load. • The wear rate tends to decrease with increasing aging time. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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