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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Schrittesser, Bernd
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Topics
Publications (7/7 displayed)
- 2020Tailored Interfaces in Fiber-Reinforced Elastomerscitations
- 2020Influence of Fiber Orientation and Adhesion Properties On Tailored Fiber-reinforced Elastomerscitations
- 2020Viscoelastic Behavior of Glass-Fiber-Reinforced Silicone Composites Exposed to Cyclic Loadingcitations
- 2020The Tension-Twist Coupling Mechanism in Flexible Compositescitations
- 2019The Effect of the Surface Area of Carbon Black Grades on HNBR in Harsh Environmentscitations
- 2017Einfluss der Alterung auf HNBR in der Erdölindustrie
- 2015Cyclic tests on cracked round bars as a quick tool to assess the long term behaviour of thermoplastics and elastomerscitations
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article
Einfluss der Alterung auf HNBR in der Erdölindustrie
Abstract
<p>Elastomers are a popular class of materials in oilfield applications as down-hole packers, seals, gaskets etc., due to their soft, nearly elastic and nearly incompressible nature. However, the performance of those properties depends mainly on three factors in operation: the viscoelastic effects, working temperature and the surrounding media. Elevated application temperatures may lead to chemical degradations in the material, while various surrounding media may result in the absorption of liquid by the elastomer (swelling), extraction of soluble constituents from the elastomer or chemical reactions with the elastomeric material. Therefore, in the present work, the ageing behaviour (thermal and under the influence of swelling media) of hydrogenated acrylonitrile butadiene rubber (HNBR) in different conditions was characterised. Additionally, the Flory-Rehner theory for swelling, based on equilibrium swelling experiments was derived identifying the crosslink density changes in thermo-oxidative ageing. The results indicated that the thermal ageing process deteriorated the material leading to clearly decreasing tensile stress and strain at break as well as damping properties. Additionally, the rigidity and the glass transition temperature of the material rises. In equilibrium swelling state, the mechanical properties were significantly reduced, however, they were fully restored in de-swollen state. The thermally aged samples demonstrated relatively low swelling behaviour and less mechanical property degradations compared to the virgin material. Based on the swelling amounts, the modified Flory-Rehner equation derives a relatively high crosslink density for thermo-oxidative aged samples compared to the virgin state, confirming the observed mechanical test results.</p>