Accelerated Aging Behaviors and Mechanism of Fluoroelastomer in Lubricating Oil Medium

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...

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Bibliographic Details
Published in:Chinese journal of polymer science 2020-08, Vol.38 (8), p.853-866
Main Authors: Wang, Qi-Long, Pei, Jing-Ke, Li, Gao, He, Xi, Niu, Yan-Hua, Li, Guang-Xian
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Cleavage
Condensed Matter Physics
Coupling (molecular)
Crosslinking
Fluoropolymers
Glass transition temperature
High temperature
Industrial Chemistry/Chemical Engineering
Lubricating oils
Polymer Sciences
Reconstruction
Temperature
Temperature dependence
Tensile strength
Thermal stability
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Summary: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 V e , and glass transition temperature T g 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.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-020-2410-1