Non-contact method used to determine the swelling/shrinking coefficients under CO2 sorption/desorption on an HNBR O-ring - Study of coupling with temperature and pressure

Lainé, Éric; Grandidier, Jean-Claude; Guiffard, Benoît; Omnès, B.; Boyer, Séverine A.E.

doi:10.1016/j.polymertesting.2020.106411

Cited by 10 publications

(20 citation statements)

References 31 publications

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“…Sorption is an important chemical process in solid membranes, and desorption is the reverse process; both follow similar diffusion laws [1]. Gas sorption and desorption are critical factors introduced to control the permeation property in sealing applications [2,3]. The permeation efficiency is related not only to the equilibrium features but also to the kinetics of both processes under high-pressure environments [4,5].…”

Section: Introductionmentioning

confidence: 99%

Volume Dependence of Hydrogen Diffusion for Sorption and Desorption Processes in Cylindrical-Shaped Polymers

et al. 2022

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In the actual application of gas transport properties under high pressure, the important factors are sample size dependence and permeation efficiency, related to gas sorption. With a modified volumetric analysis technique, we firstly measured the overall diffusion properties and equilibrium times for reaching the saturation of hydrogen content in both hydrogen sorption and desorption processes. The measured parameters of total uptake (C∞), total desorbed content (C0), diffusion coefficient in sorption (Ds), diffusion coefficient in desorption (Dd), sorption equilibrium time (ts) and desorption equilibrium time (td) of hydrogen in two polymers were determined relative to the diameter and thickness of the cylindrical-shaped polymers in the two processes. C∞ and C0 did not demonstrate an appreciable volume dependence for all polymers. The identical values of C∞ and C0 indicate the reversibility between sorption and desorption, which is interpreted by the occurrence of physisorption by sorbed hydrogen molecules. However, the measured diffusivity of the polymers was found to be increased with increasing thickness above 5 mm. Moreover, the larger Dd values measured in the desorption process compared to Ds may be attributed to an increased amorphous phase and volume swelling caused by increased hydrogen voids and polymer chain scission after decompression. The ts and td were found to be linearly proportional to the square of the thickness above an aspect ratio of 3.7, which was consistent with the numerical simulations based on the solution of Fick’s law. This finding could be used to predict the ts in a polymer without any measurement, depending on the sample size.

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Section: Introductionmentioning

confidence: 99%

Volume Dependence of Hydrogen Diffusion for Sorption and Desorption Processes in Cylindrical-Shaped Polymers

et al. 2022

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“…One of the first difficulties is related to the geometry of the sample, which is not well suited for classical mechanical tests. If many works exist in the literature, they generally concern materials made in bulk or plates [32,33]. There is always a question about the properties of the O-rings, which are developed with an industrial process that can be slightly different from those of the laboratories.…”

Section: Introductionmentioning

confidence: 99%

“…The system couples mechanical tests under temperature and CO 2 pressure control with an in situ optical local deformation measurement that permits to follow the behavior of different elastomers (in the limit hypothesis of small strains). The experimental methodology was revisited to be adapted to seals geometries to be applied as widely as possible [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Identification of swelling/shrinking coefficients under CO₂ on an FKM O-ring – Comparison with HNBR and influence of reinforcements on the matrices

Lainé

Grandidier

Boyer

et al. 2022

Matériaux & Techniques

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A better understanding of elastomers’ behavior during Rapid Gas Decompression (RGD) requires advanced knowledge of what is happening during gas sorption and desorption. This will offer to improve numerical simulation phenomena to consider a real environmental use of an O-ring, as for thermal applications. A previous experimental study developed testing protocols to investigate the performance of elastomeric O-rings. The non-contact measurement technique has been validated to identify the swelling and shrinking coefficients during sorption and desorption of carbon dioxide (CO2) from a Hydrogenated Nitrile Butadiene Rubber (HNBR) O-ring. The present work describes the effect of CO2 pressures on Fluorocarbon rubber (FKM) seals behavior coupled with temperature. To evaluate the effect of reinforcing the HNBR and FKM matrices with nanofillers, experimental tests were carried out and compared with those of the two elastomers without fillers. The four materials’ CO2 sorption and desorption coefficients are identified, and their swelling upon decompression is measured. It appears that HNBR is the best candidate under the applied service conditions. On the other hand, the nanofillers introduced in the elastomers may cause some early damages under RGD conditions.

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“…HNBR is easy to crystallize in low‐temperature environments since the presence of the continuous methylene units in the macromolecular chains, which makes the HNBR‐based seals prone to brittle fracture. [ 22‐25 ] In the case of maintaining excellent oil resistance, the lowest service temperature of HNBR is explored to expand the application fields. Studies regarding to the mechanical properties, oil resistance, and low‐temperature performance of NBR/HNBR blends are rarely reported.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the mechanical properties and oil resistance of sulfur cured nitrile rubber/hydrogenated nitrile butadiene rubber blends

Zou

Jing

et al. 2021

Polymer Engineering & Sci

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Nitrile rubber (NBR)/hydrogenated nitrile butadiene rubber (HNBR) blends with various ratios were compounded with internal mixer and two‐roll open mill. Mechanical properties and low‐temperature performance (TR10) of the NBR/HNBR blends after aging under different conditions were investigated. Furthermore, equilibrium swelling test and moving die rheometer (MDR) test were used to systematically investigate the effects of HNBR dosage on the crosslink densities and curing behaviors. Vulcanization torque and crosslink densities decreased with an increase in HNBR content. The crosslink density of pure HNBR is higher than that of pure NBR, which is related to the macromolecular structures of the rubber. Compression sets of the NBR/HNBR vulcanizates were correlated with HNBR dosage indicating a linear relationship. Low‐temperature performance of the NBR/HNBR blends was improved after being aged in the synthetic hydrocarbon hydraulic oils (SH‐1 and SH‐2). This work shows that the low‐temperature performance and oil resistance could be better balanced by blending NBR with HNBR, while the mechanical properties maintain relatively high level.

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Non-contact method used to determine the swelling/shrinking coefficients under CO2 sorption/desorption on an HNBR O-ring - Study of coupling with temperature and pressure

Cited by 10 publications

References 31 publications

Volume Dependence of Hydrogen Diffusion for Sorption and Desorption Processes in Cylindrical-Shaped Polymers

Volume Dependence of Hydrogen Diffusion for Sorption and Desorption Processes in Cylindrical-Shaped Polymers

Identification of swelling/shrinking coefficients under CO₂ on an FKM O-ring – Comparison with HNBR and influence of reinforcements on the matrices

Investigation on the mechanical properties and oil resistance of sulfur cured nitrile rubber/hydrogenated nitrile butadiene rubber blends

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Non-contact method used to determine the swelling/shrinking coefficients under CO2 sorption/desorption on an HNBR O-ring - Study of coupling with temperature and pressure

Cited by 10 publications

References 31 publications

Volume Dependence of Hydrogen Diffusion for Sorption and Desorption Processes in Cylindrical-Shaped Polymers

Volume Dependence of Hydrogen Diffusion for Sorption and Desorption Processes in Cylindrical-Shaped Polymers

Identification of swelling/shrinking coefficients under CO2 on an FKM O-ring – Comparison with HNBR and influence of reinforcements on the matrices

Investigation on the mechanical properties and oil resistance of sulfur cured nitrile rubber/hydrogenated nitrile butadiene rubber blends

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Product

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Identification of swelling/shrinking coefficients under CO₂ on an FKM O-ring – Comparison with HNBR and influence of reinforcements on the matrices