Accelerated Aging Behaviors and Mechanism of Fluoroelastomer in Lubricating Oil Medium

Qi-Long Wang; Jing-Ke Pei; Gao Li; Xi He; Yan-Hua Niu; Guang-Xian Li

doi:10.1007/s10118-020-2410-1

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Accelerated Aging Behaviors and Mechanism of Fluoroelastomer in Lubricating Oil Medium

ARTICLE | Updated：2020-05-21

- Accelerated Aging Behaviors and Mechanism of Fluoroelastomer in Lubricating Oil Medium
- Chinese Journal of Polymer Science Vol. 38, Issue 8, Pages: 853-866(2020)
- Affiliations：
  
  College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering of China, Sichuan University, Chengdu 610065, China
- Author bio：
  
  yhniu@scu.edu.cn (Y.H.N.)
  guangxianli@scu.edu.cn (G.X.L.)
- Funds：
- DOI：10.1007/s10118-020-2410-1
  CLC：
- Received：14 December 2019，
  
  Revised：2020-2-18，
  
  Accepted：24 February 2020，
  
  Online First：21 May 2020，
  
  Published：2020-08
- Accepted：
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Wang, Q. L.; Pei, J. K.; Li, G.; He, X.; Niu, Y. H.; Li, G. X. Accelerated aging behaviors and mechanism of fluoroelastomer in lubricating oil medium. Chinese J. Polym. Sci. 2020, 38, 853–866

Qi-Long Wang, Jing-Ke Pei, Gao Li, et al. Accelerated Aging Behaviors and Mechanism of Fluoroelastomer in Lubricating Oil Medium[J]. Chinese Journal of Polymer Science, 2020, 38(8): 853-866.
Wang, Q. L.; Pei, J. K.; Li, G.; He, X.; Niu, Y. H.; Li, G. X. Accelerated aging behaviors and mechanism of fluoroelastomer in lubricating oil medium. Chinese J. Polym. Sci. 2020, 38, 853–866 DOI： 10.1007/s10118-020-2410-1.

Qi-Long Wang, Jing-Ke Pei, Gao Li, et al. Accelerated Aging Behaviors and Mechanism of Fluoroelastomer in Lubricating Oil Medium[J]. Chinese Journal of Polymer Science, 2020, 38(8): 853-866. DOI： 10.1007/s10118-020-2410-1.

摘要

Abstract

The aging behaviors and mechanism of fluoroelastomer (FKM) under lubricating oil (FKM-O) and air (FKM-A

as a comparison) at elevated temperatures were studied from both physical and chemical viewpoints. The obvious changes of mechanical and swelling performances indicate that the coupling effect of lubricating oil and temperature causes more serious deterioration of FKM-O compared to that of FKM-A. Meanwhile

much stronger temperature dependence of both bulk properties and micro-structures for FKM-O is found. Three-stage physical diffusion process is defined in FKM-O due to the competition between oil diffusion and elastic retraction of network. FTIR results reveal that the dehydrofluorination reaction causes the fracture of C―F bonds and produces a large number of C＝C bonds in the backbone. The coupling effect of oil medium and high temperature could accelerate the scission of C＝C bonds and generate a series of fragments with different molecular sizes. The TGA results

crosslinking density

and glass transition temperature

derived from different measurements coherently demonstrate the network destruction in the initial stage and the simultaneous reconstruction occurring at the final stage. The newly formed local network induced by reconstruction cannot compensate the break of the original rubber network and thus only provides lower tensile strength and thermal stability.

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Keywords

references

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