Accelerated thermal ageing studies on nitrile rubber O-rings

Morrell, Paul; Patel, Mogon; Skinner, Anthony R.

doi:10.1016/s0142-9418(02)00171-x

Cited by 68 publications

(47 citation statements)

References 4 publications

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“…This apparent crosslink density may be readily measured using only very basic equipment, and can be used to estimate the mechanical properties of a complex part, based on prior knowledge of the relationship between crosslink density and stiffness. Although compression set was not considered in the work presented here, a similar correlation between compression set and crosslink density of air aged NBR specimens has been reported previously by Morrell et al [22].…”

Section: Introductionsupporting

confidence: 82%

The effect of hydrocarbon ageing on the mechanical properties, apparent crosslink density and CO2 diffusion of a hydrogenated nitrile butadiene rubber (HNBR)

et al. 2015

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a b s t r a c tThe effect of ageing in a sweet oil environment on the tensile properties, apparent crosslink density, CO 2 diffusion and Shore hardness of a typical carbon black reinforced hydrogenated nitrile butadiene rubber (HNBR) is presented. Different ageing conditions yielded materials with different properties, attributed to varying degrees of apparent crosslinking. These results showed that, with increasing apparent crosslink density, tensile stiffness and hardness increased, while CO 2 diffusivity and saturation swelling in chloroform decreased. The relationships between these properties suggests that geometry independent tests (such as solvent swelling) may be performed on parts retrieved from service in order to predict properties (such as tensile stiffness or gas diffusion) which cannot normally be measured on retrieved parts due to geometrical constraints.

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Section: Introductionsupporting

confidence: 82%

The effect of hydrocarbon ageing on the mechanical properties, apparent crosslink density and CO2 diffusion of a hydrogenated nitrile butadiene rubber (HNBR)

et al. 2015

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“…The values of E a as a function of α depicted in Fig. signify the oxidative cross linking process taking place during the thermal degradation of NBR . The trend of E a obtained using Flynn–Wall are similar compared with that of Kissinger method.…”

Section: Resultsmentioning

confidence: 54%

Dynamic Mechanical Behavior, Solvent Resistance and Thermal Degradation of Nitrile Rubber Composites With Carbon Black‐Halloysite Nanotube Hybrid Fillers

Krishnamurthy

Balakrishnan

2018

Polymer Composites

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In this work, nitrile rubber (NBR) conventional composites containing 70 phr carbon black (CB) is taken for study. New NBR hybrid composites containing 60 phr of CB and varied halloysite nanotube (HNT) loading of 2, 4, 6, 8, and 10 phr were developed. Experimental investigations were carried out to study the synergistic effect of CB and HNT on the dynamical mechanical properties, solvent resistance, thermal stability and degradation kinetics of NBR hybrid composites. Morphological analysis using X‐ray diffraction analysis (XRD) and Field emission scanning electron microscopy (FESEM) revealed the presence of intercalated structures and formation of local CB‐HNT filler network in the NBR matrix. The glass transition temperatures (Tg) of hybrid composites were raised with the addition of HNT which indicates strong interfacial adhesion between NBR–CB–HNT. Dynamic mechanical analysis and solvent uptake studies revealed that replacement of 10 phr CB by 6 phr HNT in hybrid composites improved the storage modulus by 44% at 30°C and solvent resistance by 29%, respectively. Most importantly, the incorporation of HNT could effectively improve the thermal stability of the NBR hybrid composites according to thermogravimetric analysis and oxidation induction time studies. The activation energy of the thermal decomposition of the hybrid composites increased with the addition of HNT. POLYM. COMPOS., 40:E1612–E1621, 2019. © 2018 Society of Plastics Engineers

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“…This equation is suitable when there is only one reaction cause the degradation, otherwise requiring modified type [14][15][16][17][18]. However, we essentially make use of shift factor (α T ) to account for the temperature dependence of a degradation process [19][20][21][22][23][24][25][26][27][28][29][30][31]. This is because the shift factor can be easily normalized to any temperature desired (i.e.…”

Section: Lifetime Prediction For Thermal Ageing Processmentioning

confidence: 99%

Accelerated thermal ageing studies of polydimethylsiloxane (PDMS) rubber

et al. 2012

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Thermal ageing studies over relative high temperature range (from 250°C to 85°C) have been conducted on polydimethylsiloxane (PDMS) rubber with the aim of investigating ageing behavior. Tensile elongation, compression set and creep measurements are introduced to monitor the ageing process. Time temperature superposition is performed and the linear trends are found in the Arrhenius plots for all the approaches, revealing an identical process dominates the degradation process. Activation energies are found to be depended on the methods used, which are 88.5 kJ/mol for tensile tests, 67.7 kJ/mol for compression set measurements and 75.3 kJ/mol for creep measurements. The phenomenon that activation energy obtained from tensile elongation is always higher than other approaches is rationalized by the sensitive modification of thermal degradation on the rubbery network. Moreover, correlations between the results from different approaches have been examined. The linear relationships have been found between tensile elongation and creep or compression set measurements for the three methods are all influenced by the network structure.

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Accelerated thermal ageing studies on nitrile rubber O-rings

Cited by 68 publications

References 4 publications

The effect of hydrocarbon ageing on the mechanical properties, apparent crosslink density and CO2 diffusion of a hydrogenated nitrile butadiene rubber (HNBR)

The effect of hydrocarbon ageing on the mechanical properties, apparent crosslink density and CO2 diffusion of a hydrogenated nitrile butadiene rubber (HNBR)

Dynamic Mechanical Behavior, Solvent Resistance and Thermal Degradation of Nitrile Rubber Composites With Carbon Black‐Halloysite Nanotube Hybrid Fillers

Accelerated thermal ageing studies of polydimethylsiloxane (PDMS) rubber

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