Degradation of EPDM seal used for water supplying system

Nakamura, Tsutomu; Chaikumpollert, Oraphin; Yamamoto, Yasuhiko; Ohtake, Yoshito; Kawahara, Seiichi

doi:10.1016/j.polymdegradstab.2011.04.007

Cited by 29 publications

(29 citation statements)

References 21 publications

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“…5 thermal shock tests.The results demonstrated that elastomers with hydrocarbon chains may have a great stability in hydrothermal and harsh chemical environments but are vulnerable to the hot dry air quenching. These results are in agreement with reference[18], which suggests degradation involving oxygen incorporation and chain scission, followed by reactions with the free radicals and deposition of derivatives of each polymeric section of the poly(ethylene-copropylene-co-5-ethylidene-2-norbornene) EPDM terpolymer structure(Figure 4). Similarly, in the case of the FEPM, degradation in the thermal shock tests may be initiated at Poly-P unit while the CF and CF 2 bonds in the Poly TFE survive (Figure 5)[21][22][23].To support the above information and evaluate changes in the thermal stability of the elastomers after the exposures to the aggressive environments, the thermal degradation of the O-rings was evaluated at temperatures of up to 700°C.…”

supporting

confidence: 92%

“…Also, the spectra showed stretching vibration bands (V C=C ) at 1634 cm -1 (EPDM) [18] and 1650 cm -1 (FEPM) after exposure to aerated steam/cooling, drilling (both EPDM and FEPM) and geo-brine (FEPM) fluids. Thus the EPDM and FEPM O-rings appeared to undergo some oxidation with the formation of oxidation derivatives in these environments.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

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Degradation of different elastomeric polymers in simulated geothermal environments at 300 °C

Sugama

Pyatina

Redline

et al. 2015

Polymer Degradation and Stability

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This study evaluates the degradation of six different elastomeric polymers used for O-rings: EPDM, FEPM, type I-and II-FKM, FFKM, and FSR, in five different simulated geothermal environments at 300°C: 1) non-aerated steam/cooling cycles, 2) aerated steam/cooling cycles, 3)water-based drilling fluid, 4) CO 2 -rich geo-brine fluid, and, 5) heat-cool water quenching cycles.The factors assessed included the extent of oxidation, changes in thermal behavior, microdefects, permeation of ionic species from the test environments into the O-rings, silicate-related scale-deposition, and changes in the O-rings' inverse tensile compliance.The reliability of the O-ring to maintain its integrity depended on the elastomeric polymer composition and the exposure environment. FSR disintegrated while EPDM was oxidized only to some degree in all the environments, FKM withstood heat-water quenching but underwent chemical degradation, FEPM survived in all the environments with the exception of heat-water quenching where it underwent severe oxidation-induced degradation, and FFKM displayed outstanding compatibility with all the tested environments. The paper discusses the degradation mechanisms of the polymers under the aforementioned conditions.

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confidence: 92%

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Degradation of different elastomeric polymers in simulated geothermal environments at 300 °C

Sugama

Pyatina

Redline

et al. 2015

Polymer Degradation and Stability

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“…Planes et al [16] gave the same conclusion for another EPDM composition. They also showed that peroxide remains in the material after thermal crosslinking and that the diene consumption is incomplete [3,17], suggesting that both are available for potential chemical reactions during the radio-oxidation [18,19]. Nevertheless, there is still a lack of studies on the microstructure evolution of EPDM as a function of their chemical composition.…”

Section: Introductionmentioning

confidence: 99%

Influence of PE/PP ratio and ENB content on the degradation kinetics of γ-irradiated EPDM

Almeida

Chazeau

Vigier

et al. 2014

Polymer Degradation and Stability

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“…It is known that the morphology of an elastomer blend specimen is affected due to several factors such as blend ratio and composition. Additionally, the mechanical properties of the rubber blends strongly depend on the morphology . In order to figure out this relationship, SEM photos of the blend specimens were obtained.…”

Section: Resultsmentioning

confidence: 99%

Development of an intermediate layer for multilayer hoses used in turbo lines of motor vehicles

Ünal

Meriçboyu

2018

J of Applied Polymer Sci

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Multilayer hoses for turbo lines can be produced by ethylene acrylic rubber (AEM) as the inner layer and peroxide cured ethylene propylene diene monomer (EPDM) as the outer layer. In such a case, the polar AEM should adhere well to the apolar EPDM to ensure proper functioning. In this work, new blends were developed and optimized to offer potential for using as intermediate bonding layers. Different compositions of dipolymer AEM/EPDM and terpolymer AEM/EPDM blends with and without maleic anhydride grafted EPDM (Ma‐g‐EPDM) as a compatibilizer were successfully prepared. Curing behaviors, as well as mechanical and thermal properties of the blends were investigated in detail. The effects of the compatibilizer addition were also explored by dynamical mechanical analysis, DeMattia and scanning electron microscope. It is found that Ma‐g‐EPDM is more effective in terpolymer AEM containing blends. Additionally, 60/40:AEM/EPDM weight ratio is the most suitable proportion for turbo lines. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46525.

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Degradation of EPDM seal used for water supplying system

Cited by 29 publications

References 21 publications

Degradation of different elastomeric polymers in simulated geothermal environments at 300 °C

Degradation of different elastomeric polymers in simulated geothermal environments at 300 °C

Influence of PE/PP ratio and ENB content on the degradation kinetics of γ-irradiated EPDM

Development of an intermediate layer for multilayer hoses used in turbo lines of motor vehicles

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