Aging characterization of different nitrile butadiene rubbers for sealing in a pneumatic system: Linking the change of the physicochemical state to the mechanical properties

Redon, Adrien; Cam, Jean‐Benoît Le; Robin, Éric; Miroir, Mathieu; Fralin, Jean‐Charles

doi:10.1002/app.54068

Cited by 4 publications

(2 citation statements)

References 44 publications

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“…A second method lies in the assumption that χ is equal to the addition of an entropic χ s and an enthalpic χ H contributions. 57 It is also known as the Hildebrand relation, and it is given by Equation (12).…”

Section: The Flory-huggins Interactionmentioning

confidence: 99%

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A comprehensive review on active chain density evaluation from swelling and insights for better accounting for insoluble particles

Delahaye,

Redon,

Ruellan

et al. 2024

J of Applied Polymer Sci

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The present study provides a state of the art on methods for evaluating active chain density of rubbers from swelling experiments. This review focuses more particularly on the effects of components that are known to limit the swelling, and which typically results in an overestimation of the active chain density. These components are commonly considered as insoluble. Different corrections dealing with the two principal insoluble components, namely zinc oxide (Zn0) and carbon black (CB) filler, are thoroughly investigated. A comparative study on the same natural rubber (NR), either filled and unfilled, vulcanized with three different vulcanization systems, is performed to evaluate the relevance of each predictive approach. The results obtained highlight their respective limitations. In particular, it is shown that the swelling ratio of unfilled and filled natural rubbers are linearly related, suggesting that fillers have no significant effect on the overall number of cross‐links formed during vulcanization. As a result, we propose a unified approach for correcting the ZnO content for unfilled NR and both the ZnO and CB contents for filled NR. By comparing with results issued from uniaxial tensile tests, it is shown that the use of a mechanical response is a relevant alternative for determining the active chain density.

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Section: The Flory-huggins Interactionmentioning

confidence: 99%

“…), as long as the type of solvent is appropriate. [12][13][14] This insight is fully addressed in Section 2.1.…”

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confidence: 94%

A comprehensive review on active chain density evaluation from swelling and insights for better accounting for insoluble particles

Delahaye,

Redon,

Ruellan

et al. 2024

J of Applied Polymer Sci

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Advantages of using a dual‐filler system with carbon black and rockwool fiber on Nitrile Rubber composites from a technical standpoint

da Rocha,

de Sousa,

Furtado

2024

Polymer Composites

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This study produced and characterized composites based on nitrile rubber reinforced with rockwool fiber (RW) and carbon black (CB). Ten formulations with dual‐filler loading amounts ranging from 0 to 40 phr of CB and RW were designed using a simplex‐centroid mixture. The composites were assessed regarding their rheometric, rheological, mechanical, and thermal properties. The use of the RW in the dual‐filler system contributed to overall improvements in Shore A hardness, tear strength, modulus at 50%, and resilience, as well as reducing the Payne effect. Instead of using 40 phr of CB alone, a dual‐filler system comprising 20 phr of CB and 20 phr of RW lowers the Payne effect by around 60%, improves resilience by 35%, modulus at 50% strain by 8%, and the residual stress at equilibrium (σ∞/σ0) by 7%. On the other hand, the tensile strength is reduced by 23%. The optimum cure time, crosslink density, and maximum decomposition rate temperature were not affected by the rockwool's presence in the dual‐filler system. In general, the use of RW in combination with CB is advantageous mainly because it reduces compressive stress relaxation, which is an important property for sealing applications.Highlights Dual‐filler systems based on carbon black (CB) and rockwool fiber (RW) offer advantages. RW‐rich dual‐filler systems reduce stress relaxation. RW‐rich dual‐filler systems reduce the Payne effect. CB‐rich dual‐filler systems increase tensile strength.

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Modeling and analysis of minor seal leakages in high-pressure hydrogen valves under extreme environmental temperatures

Gao,

Hu,

et al. 2024

International Journal of Hydrogen Energy

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Aging characterization of different nitrile butadiene rubbers for sealing in a pneumatic system: Linking the change of the physicochemical state to the mechanical properties

Cited by 4 publications

References 44 publications

A comprehensive review on active chain density evaluation from swelling and insights for better accounting for insoluble particles

A comprehensive review on active chain density evaluation from swelling and insights for better accounting for insoluble particles

Advantages of using a dual‐filler system with carbon black and rockwool fiber on Nitrile Rubber composites from a technical standpoint

Modeling and analysis of minor seal leakages in high-pressure hydrogen valves under extreme environmental temperatures

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