Influence of Thermal Aging in Oil on the Friction and Wear Properties of Nitrile Butadiene Rubber

Jiang, Bingqi; Jia, Xin; Wang, Zixi; Wang, Tao; Guo, Fei; Wang, Yuming

doi:10.1007/s11249-019-1201-8

Cited by 28 publications

(22 citation statements)

References 32 publications

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“…During natural oxidative aging, the carbon atoms in the butadiene double bonds are attacked by oxygen atoms forming free radicals, which break the double bond. The crosslink network of NBR becomes weaker as it ages, decreasing the hardness [16,33].…”

Section: Hardness Testmentioning

confidence: 99%

“…From room temperature to 150 °C, Mengistu et al [15] determined the activation energy of HNBR with varied acrylonitrile levels, and the acrylonitrile level was unaffected by the heat aging conditions used. Jiang et al [16] studied the effects of thermal aging on NBR in hydraulic oil for 70 days at 60 °C and 90 °C, finding that the Shore -A hardness value initially decreased and then increased. Although much research [17][18][19][20][21][22][23] has already been conducted on the thermal decomposition and accelerated aging of NBR, very few studies have been conducted to calculate the activation energy and pre-exponential factors to assess the life of virgin NBR and its comparison with naturally aged NBR under no-load conditions.…”

Section: Introductionmentioning

confidence: 99%

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Thermal degradation of naturally aged NBR with time and temperature

Ammineni

Nagaraju

Dumpala

2022

Mater. Res. Express

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Nitrile butadiene rubber (NBR) is a polymer widely used in pipe fittings as a sealing and damping element. The performance of the polymer materials degrades with time and temperature. The present work emphasizes the thermal degradation of NBR materials using thermogravimetric analysis (TGA) at heating rates of 5, 10, 15, and 20 °C min−1 in a controlled nitrogen environment. Model-free methods, namely the Kissenger, Kissinger-Akahira-Sunose (KAS), and Ozawa-Flynn-Wall (OFL) approaches, are used to determine the kinetic activation energy and frequency factor. The obtained values were used to calculate the lifetime of virgin NBR and the remaining life of naturally aged NBR. Fourier-transform infrared spectroscopy (FTIR) was used to detect changes in the functional groups of the NBR material with age. From the experimental data, it is concluded that virgin NBR has better thermal stability than naturally aged NBR. Furthermore, the activation energy of NBR is temperature-dependent, and oxidative aging has a significant impact on the degradation of kinetic parameters. At lower conversion rates, the activation energy of virgin NBR (79.39 kJ mol−1) and aged NBR (78.25 kJ mol−1) are almost the same, while at increased conversion rates, virgin NBR (529.77 kJ mol)−1 has higher activation energy than aged NBR (280.15 kJ mol−1).

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Section: Hardness Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal degradation of naturally aged NBR with time and temperature

Ammineni

Nagaraju

Dumpala

2022

Mater. Res. Express

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“…It is also an essential elastomer in aviation, petroleum, and other fields. [ 1,2 ] However, with an increase in acrylonitrile content, the compression set increases, and meanwhile, the unsaturated olefin chain segments in the main chain limit the widespread use of NBR‐based vulcanizates. [ 3‐5 ] In 1980s, hydrogenated nitrile butadiene rubber (HNBR) was developed by German Bayer and Japan Zeon Company as a new type of elastomer.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the mechanical properties and oil resistance of sulfur cured nitrile rubber/hydrogenated nitrile butadiene rubber blends

Zou

Jing

et al. 2021

Polymer Engineering & Sci

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Nitrile rubber (NBR)/hydrogenated nitrile butadiene rubber (HNBR) blends with various ratios were compounded with internal mixer and two‐roll open mill. Mechanical properties and low‐temperature performance (TR10) of the NBR/HNBR blends after aging under different conditions were investigated. Furthermore, equilibrium swelling test and moving die rheometer (MDR) test were used to systematically investigate the effects of HNBR dosage on the crosslink densities and curing behaviors. Vulcanization torque and crosslink densities decreased with an increase in HNBR content. The crosslink density of pure HNBR is higher than that of pure NBR, which is related to the macromolecular structures of the rubber. Compression sets of the NBR/HNBR vulcanizates were correlated with HNBR dosage indicating a linear relationship. Low‐temperature performance of the NBR/HNBR blends was improved after being aged in the synthetic hydrocarbon hydraulic oils (SH‐1 and SH‐2). This work shows that the low‐temperature performance and oil resistance could be better balanced by blending NBR with HNBR, while the mechanical properties maintain relatively high level.

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“…Efficiently reducing the friction and wear of dynamic rubber seals can greatly prevent leakage, maintain gas pressure, and exclude dirt, thereby benefiting to energy conservation and environmental protection [1][2][3]. Considerable methods have been devoted to optimize the friction performance of dynamic rubber seals.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the tribological performance of DLC-coated NBR rubber: The role of hydrogen in films

Chun

Zhang

et al. 2021

Friction

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Diamond-like carbon (DLC) films directly deposited on rubber substrate is undoubtedly one optimal option to improve the tribological properties due to its ultralow friction, high-hardness as well as good chemical compatibility with rubber. Investigating the relationship between film structure and tribological performance is vital for protecting rubber. In this study it was demonstrated that the etching effect induced by hydrogen incorporation played positive roles in reducing surface roughness of DLC films. In addition, the water contact angle (CA) of DLC-coated nitrile butadiene rubber (NBR) was sensitive to the surface energy and sp2 carbon clustering of DLC films. Most importantly, the optimum tribological performance was obtained at the 29 at% H-containing DLC film coated on NBR, which mainly depended on the following key factors: (1) the DLC film with appropriate roughness matched the counterpart surface; (2) the contact area and surface energy controlled interface adhesive force; (3) the microstructure of DLC films impacted load-bearing capacity; and (4) the generation of graphitic phase acted as a solid lubricant. This understanding may draw inspiration for the fabrication of DLC films on rubber to achieve low friction coefficient.

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Influence of Thermal Aging in Oil on the Friction and Wear Properties of Nitrile Butadiene Rubber

Cited by 28 publications

References 32 publications

Thermal degradation of naturally aged NBR with time and temperature

Thermal degradation of naturally aged NBR with time and temperature

Investigation on the mechanical properties and oil resistance of sulfur cured nitrile rubber/hydrogenated nitrile butadiene rubber blends

Optimizing the tribological performance of DLC-coated NBR rubber: The role of hydrogen in films

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