Detection of the Destruction Mechanism of Perfluorinated Elastomer (FFKM) Network under Thermo-oxidative Aging Conditions

Wen-Yue Zhuo; Qi-Long Wang; Gao Li; Guo Yang; Huan Zhang; Wen Xu; Yan-Hua Niu; Guang-Xian Li

doi:10.1007/s10118-022-2692-6

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Detection of the Destruction Mechanism of Perfluorinated Elastomer (FFKM) Network under Thermo-oxidative Aging Conditions

RESEARCH ARTICLE | Updated：2022-04-26

- Detection of the Destruction Mechanism of Perfluorinated Elastomer (FFKM) Network under Thermo-oxidative Aging Conditions
- Chinese Journal of Polymer Science Vol. 40, Issue 5, Pages: 504-514(2022)
- Affiliations：
  
  a.College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering of China, Sichuan University, Chengdu 610065, China
  b.Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
- Author bio：
  
  yhniu@scu.edu.cn (Y.H.N.)
  guangxianli@scu.edu.cn (G.X.L.)
- Funds：
- DOI：10.1007/s10118-022-2692-6
  CLC：
- Received：23 November 2021，
  
  Revised：2021-12-24，
  
  Accepted：08 January 2022，
  
  Online First：11 March 2022，
  
  Published：01 May 2022
- Accepted：
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Zhuo, W. Y.; Wang, Q. L.; Li, G.; Yang, G.; Zhang, H.; Xu, W.; Niu, Y. H.; Li, G. X. Detection of the destruction mechanism of perfluorinated elastomer (FFKM) network under thermo-oxidative aging conditions. Chinese J. Polym. Sci. 2022, 40, 504–514

Wen-Yue Zhuo, Qi-Long Wang, Gao Li, et al. Detection of the Destruction Mechanism of Perfluorinated Elastomer (FFKM) Network under Thermo-oxidative Aging Conditions[J]. Chinese Journal of Polymer Science, 2022, 40(5): 504-514.
Zhuo, W. Y.; Wang, Q. L.; Li, G.; Yang, G.; Zhang, H.; Xu, W.; Niu, Y. H.; Li, G. X. Detection of the destruction mechanism of perfluorinated elastomer (FFKM) network under thermo-oxidative aging conditions. Chinese J. Polym. Sci. 2022, 40, 504–514 DOI： 10.1007/s10118-022-2692-6.

Wen-Yue Zhuo, Qi-Long Wang, Gao Li, et al. Detection of the Destruction Mechanism of Perfluorinated Elastomer (FFKM) Network under Thermo-oxidative Aging Conditions[J]. Chinese Journal of Polymer Science, 2022, 40(5): 504-514. DOI： 10.1007/s10118-022-2692-6.

摘要

Two competitive processes including post-curing and network destruction occur simultaneously. FTIR and XPS further reveal that the network destruction happens preferentially on the crosslink points of TAIC structure and a schematic degradation process of TAIC structure is proposed according to the results of microscopic experiments.

Abstract

The changes of crosslinking network of perfluorinated elastomer (FFKM) cured by TAIC and DBPH under thermo-oxidative aging conditions were investigated. Two competitive processes including post-curing and network destruction occur simultaneously

which directly affect the storage modulus and crosslinking density. With the increase of aging temperature

the network destruction becomes dominant. FTIR and XPS characterizations further reveal that the network destruction happens preferentially on the crosslink points of TAIC structure

and the post-curing is mainly caused by the decomposition of residual curing agent DBPH. Unlike the easier breaking of TAIC structure in the crosslinking network

both the backbone and the pendent groups of FFKM itself are much more stable. To further figure out the destruction mechanism

TGA-FTIR-GC-MS test was also conducted and a schematic degradation process of TAIC structure was proposed. It is found that the destruction of TAIC crosslinking points happens first on the unstable exocyclic C―N bonds and the intermediate ring radicals could eventually decompose into volatile hydrogen isocyanate (HCNO) under extreme condition.

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references

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