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

Almeida, André de; Chazeau, Laurent; Vigier, G.; Marque, G.; Goutille, Yannick

doi:10.1016/j.polymdegradstab.2014.08.029

Cited by 21 publications

(11 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The consequences of radiation processing of ethylene-propylene elastomers are satisfactorily explained by a radical mechanism [ 19 , 22 , 35 , 36 , 37 , 38 ]. The competition between scission and crosslinking influences the sample morphology and oxidation level.…”

Section: Resultsmentioning

confidence: 99%

Stability Efficiencies of POSS and Microalgae Extracts on the Durability of Ethylene-Propylene-Diene Monomer Based Hybrids

Zaharescu¹,

Mateescu²

2022

Polymers

View full text Add to dashboard Cite

The EPDM (ethylene-propylene-diene monomer) hybrids with improved thermal and radiation strengths containing 1 and 5 phr of polyhedral oligomeric silsesquioxane (vinyl-POSS, Ov-POSS) and/or 2 phr of microalgae (Chlorella vulgaris (CV) and Spirulinaplatensis (SP)) powders were investigated in respect to their thermal stability after γ-irradiation. The material durability under accelerated degradation was qualified by chemiluminescence and gelation, which prove the contribution of inorganic filler and microalgae extracts on the increase of hybrid thermal stability, as well as the interaction between added components (POSS and CV or SP). The activation energies and the durabilities under accelerated degradation were calculated, indicating their suitable usage as appropriate materials in various applications. The reported results indicate the improvement effect of both microalgal powders on the oxidation strength, but the contribution of Spirulinaplatensis grabs attention on its efficient effects upon the prevention of degradation under accelerated aging conditions. The thermal performances of the tested EPDM based hybrids are remarkably ameliorated, if the certain formulation includes Ov-POSS (5 phr) and Spirulinaplatensis (2 phr), certifying its suitability for the pertinent applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Stability Efficiencies of POSS and Microalgae Extracts on the Durability of Ethylene-Propylene-Diene Monomer Based Hybrids

Zaharescu¹,

Mateescu²

2022

Polymers

View full text Add to dashboard Cite

show abstract

“…Thermoporosimetry provides the distribution of voids size at chains network scale [16], [17]. It has been employed to observe rubber damage induced by irradiation, [18] ageing [19] or stretching [20] at chains length scale. More specifically, such methods, when combined with DIC, may provide real time measures of network chains scale damage induced by the deformation [21], [22].…”

Section: Introductionmentioning

confidence: 99%

Heat source and voiding signatures of Mullins damage in filled EPDM

et al. 2020

View full text Add to dashboard Cite

The thermomechanical coupling of Mullins damage in filled EPDM has been investigated by analysing the self-heating via Infrared thermography (IR) and the voiding fraction by Digital Image Correlation (DIC). The volumetric strain measured during the rubber deformation is found to be predominantly associated with damage, while thermal dilatation caused by self-heating has a negligible contribution. On this basis, the thermomechanical coupling of Mullins phenomena has been identified by evaluating the strain and time dependence of the following criteria: the tangent modulus, the voiding rate and the heat sources. The tangent modulus that reaches a maximum at the strain transition from a series of cycle to another is found to be an appropriate mechanical signature of Mullin softening. At the same strain transition, both voiding rate upturn and heat source upturn are observed. These signatures suggest the Mullins damage to be mainly associated at high strain rate with the (re)-activation of dissipative cavitation mechanisms, by nucleation of new cavities and/or acceleration of cavities growth.

show abstract

“…On the other hand, chemical aging involves irreversible processes such as oxidation, chain scission, and additional crosslinking. The aging of elastomers such as hydrogenated nitrile butadiene rubber (HNBR) [3,4,5,6] and ethylene propylene diene rubber (EPDM) [7,8,9,10,11] as well as O-ring seals [12,13,14,15] has been investigated previously in numerous studies. During aging of EPDM, generally both chain scissions (mainly in the propylene segments [16]) and crosslinking reactions (mostly via the termonomer [8]) take place [17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of O-Ring Seal Failure under Static Conditions and Determination of End-of-Lifetime Criterion

et al. 2019

View full text Add to dashboard Cite

Determining a suitable and reliable end-of-lifetime criterion for O-ring seals is an important issue for long-term seal applications. Therefore, seal failure of ethylene propylene diene rubber (EPDM) and hydrogenated nitrile butadiene rubber (HNBR) O-rings aged in the compressed state at 125 °C and at 150 °C for up to 1.5 years was analyzed and investigated under static conditions, using both non-lubricated and lubricated seals. Changes of the material properties were analyzed with dynamic-mechanical analysis and permeability experiments. Indenter modulus measurements were used to investigate DLO effects. It became clear that O-rings can remain leak-tight under static conditions even when material properties have already degraded considerably, especially when adhesion effects are encountered. As a feasible and reliable end-of-lifetime criterion for O-ring seals under static conditions should include a safety margin for slight dimensional changes, a modified leakage test involving a small and rapid partial decompression of the seal was introduced that enabled determining a more realistic but still conservative end-of-lifetime criterion for an EPDM seal.

show abstract

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

Cited by 21 publications

References 42 publications

Stability Efficiencies of POSS and Microalgae Extracts on the Durability of Ethylene-Propylene-Diene Monomer Based Hybrids

Stability Efficiencies of POSS and Microalgae Extracts on the Durability of Ethylene-Propylene-Diene Monomer Based Hybrids

Heat source and voiding signatures of Mullins damage in filled EPDM

Analysis of O-Ring Seal Failure under Static Conditions and Determination of End-of-Lifetime Criterion

Contact Info

Product

Resources

About