Stress–thermal oxidative aging behavior of hydrogenated nitrile rubber seals

2018 ◽  
Vol 136 (7) ◽  
pp. 47014 ◽  
Author(s):  
W. Lou ◽  
W. Zhang ◽  
T. Jin ◽  
X. Liu ◽  
H. Wang
Keyword(s):  
Nitrile Rubber ◽  
Aging Behavior ◽  
Oxidative Aging ◽  
Thermal Oxidative Aging

Thermal-oxidative aging behavior of nitrile-butadiene rubber/functional LDHs composites

2016 ◽  
Vol 133 ◽  
pp. 219-226 ◽  
Author(s):  
Xianru He ◽  
Tianxiang Li ◽  
Zhengren Shi ◽  
Xin Wang ◽  
Fei Xue ◽  
...  
Keyword(s):  
Butadiene Rubber ◽  
Aging Behavior ◽  
Oxidative Aging ◽  
Nitrile Butadiene Rubber ◽  
Thermal Oxidative Aging

scholarly journals INFLUENCE OF ANYLES D, L- CAMPHORA ON THERMAL OXIDATING STABILITY OF BUTADIENE RUBBER BASED ELASTOMER

2021 ◽  
pp. 47-52
Author(s):  
A. A. Vernigora ◽  
D. A. Nilidin ◽  
A. V. Davidenko ◽  
Ngok Tu Phan ◽  
S. G. Gubin ◽  
...  
Keyword(s):  
Nitrile Rubber ◽  
Butadiene Rubber ◽  
Tetramethylthiuram Disulfide ◽  
Oxidative Aging ◽  
Butadiene Nitrile Rubber ◽  
Thermal Oxidative Aging ◽  
First Time

The influence of aniles DL-camphor as N-[(1RS)-camphane-2-ylidene]-2-methylaniline, N-[(1RS)-camphane-2-ylidene]-2-ethylaniline and N-[(1RS)-camphane-2-ylidene]aniline on vulcanization and resistance of butadiene nitrile rubber based elastomers to thermal oxidative aging was studied for the first time. The prospects of using aniles DL-camphor as anti-aging agents have been established. The best effect is achieved when using N-[(1RS)-camphane-2-ylidene]-2-methylaniline in combination with an effective vulcanisation system including sulfur donors tetramethylthiuram disulfide, 4,4'-dithiodimorpholine, and N-cyclohexylbenzothiazole-2-sulphenamide.

EV Systems for NR. II. Further Development of Curing Systems and Vulcanizate Properties

1969 ◽  
Vol 42 (2) ◽  
pp. 418-440 ◽  
Author(s):  
R. M. Russell ◽  
T. D. Skinner ◽  
A. A. Watson
Keyword(s):  
Thermal Stability ◽  
Zinc Oxide ◽  
Fatigue Cracking ◽  
Oxide System ◽  
Oxidative Aging ◽  
Thermal Oxidative Aging ◽  
Further Development ◽  
Resistance To Heat ◽  
Thermal Stability Of ◽  
Simple Network

Abstract It was shown in Part I that the use of EV systems in NR provides a simple network in which the crosslinks are mainly monosulfidic. Part II describes in some detail the properties of vulcanizates obtained by the use of EV systems and their relationship to conventional and TMTD-zinc oxide cured vulcanizates. The disadvantages of short scorch time and heavy bloom which accompany the TMTD-zinc oxide system are overcome by the new EV systems. The monosulfidic network obtained by the use of EV systems confers on NR good overall physical properties together with much improved resistance towards thermal and thermal oxidative aging. The thermal stability of this type of network is reflected in the outstanding resistance of the vulcanizates to set and reversion, and their good resistance to heat build-up under dynamic conditions. Vulcanizates derived from EV systems have increased resistance to thermal oxidative aging due to the inherent thermal stability of the networks and good response to antioxidant protection. This increased resistance results in much better retention of tensile properties, tear resistance and fatigue cracking resistance on aging, relative to that of conventionally cured vulcanizates.

scholarly journals Molecule Dynamics Simulation of the Effect of Oxidative Aging on Properties of Nitrile Rubber

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 226
Author(s):  
Jinsong Yang ◽  
Weitao Lou
Keyword(s):  
Free Volume ◽  
Dynamic Properties ◽  
Compressive Strain ◽  
Mean Square Displacement ◽  
Nitrile Rubber ◽  
Dynamics Simulation ◽  
Hydroxyl Groups ◽  
Carbonyl Groups ◽  
Fractional Free Volume ◽  
Oxidative Aging

The effects of oxidative aging on the static and dynamic properties of nitrile rubber at the molecular scale were investigated by molecular dynamics simulation. The aged nitrile rubber models were constructed by introducing hydroxyl groups and carbonyl groups into rubber molecular chains to mimic oxidative aging. The static and dynamic properties of the unaged and aged nitrile rubber under different conditions were evaluated by mean square displacement, self-diffusion coefficients, hydrogen bond, fractional free volume, radial distribution function, cohesive energy density and solubility parameter. The results show that the elevated temperature intensified significantly the mobility of rubber molecular chains and fractional free volume, while the compressive strain displayed the opposite effect resulting in packing and rearrangement of rubber chains. The introduction of hydroxyl groups and carbonyl groups enhanced the polarity, intermolecular interactions, the volume and rigidity of molecular chains, implying weaker mobility of molecular chains as compared to unaged models. The compressive strain and oxidative aging both decreased the fractional free volume, which inhibited gaseous and liquid diffusion into the rubber materials, and slowed down the oxidative aging rate. This study provides insights to better understand the effect of molecular changes due to oxidative aging on the structural and dynamic properties of rubber materials at the molecular level.

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