Permeation resistance of poly(ether ether ketone) to hydrogen, nitrogen, and oxygen gases

Monson, L.; Moon, Seung Il; Extrand, C. W.

doi:10.1002/app.37517

Cited by 23 publications

(9 citation statements)

References 9 publications

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“…PEEK is highly resistance to permeation and diffusion of gases due to its morphology and degree of crystallinity. The permeability, diffusion, and solubility coefficients on PEEK films for oxygen have been found to be independent of applied upstream pressure and thickness . It has been also reported that diffusion coefficient was reduced with increasing crosslinking density .…”

Section: Resultsmentioning

confidence: 82%

“…The permeability, diffusion, and solubility coefficients on PEEK films for oxygen have been found to be independent of applied upstream pressure and thickness. 30 It has been also reported that diffusion coefficient was reduced with increasing crosslinking density. 13 Based on these the following conclusion could be made: At high dose rates, the atmospheric oxygen is consumed on the surface before it diffuses to the centre of the polymer and degradation will occur heterogeneously and not homogeneously.…”

Section: Resultsmentioning

confidence: 93%

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The crosslinking of poly (ether ether ketone): Thermally and by irradiation

Lafi

Parker

Hay

2015

J of Applied Polymer Sci

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Crosslinking of amorphous poly (ether ether ketone) films was carried out by means of thermal annealing at 400 C as well as by irradiation with 11.0 MeV proton beam at different dose rate ranging from 1.75 to 15.5 kW g 21. The materials properties of the resulting films were investigated by mean of light microscopy, sol-gel analysis, two-dimensional infra-red correlation spectroscopy, 2DCOS-IR, and differential scanning calorimetry (DSC). It was found that both chain scission and crosslinking yields were decreased by an increase of dose rate and the ratio of crosslinks to chain scission was increased from 0.9 to 1.4. The 2DCOS-IR analysis in the region 1400-1800 cm 21 showed progressive development of new bands at 1470 and 1740 cm 21, which have been used to support the presence of crosslinking and chain scission reactions. The glass transition temperature also increased in line with increasing crosslinking density, but the results showed a limiting plateau value for the glass transition T g , which depended only on the absorbed dose. This suggests that crosslinking was limited and did not increase after a specific value of the dose rate. Crosslinking by irradiation has many advantages over thermal annealing; in particular it is a one step rapid process producing a variety of homogeneously crosslinked, good quality films available for chemical modification.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 93%

The crosslinking of poly (ether ether ketone): Thermally and by irradiation

Lafi

Parker

Hay

2015

J of Applied Polymer Sci

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“…The cost of sending materials to space has been estimated to be almost $11,000 kg −1 –$20,000 kg −1 (€9,800 kg −1 –€17,800 kg −1 approximately) with the cost significantly affected by launch type and final orbital position of the payload, and so reducing the weight of inherent systems is a main priority for future launch designs . A number of studies have already focused on the barrier properties of polymers in similar applications with PTFE, PFA, and PEEK exhibiting good barrier properties to gas permeation . Polymer liner studies have also been applied directly to COPV structures with a myriad of polymer materials being tested to determine their overall permeability.…”

Section: Introductionmentioning

confidence: 99%

Helium permeability of polymer materials as liners for composite overwrapped pressure vessels

Murray

Leen

Semprimoschnig

et al. 2016

J of Applied Polymer Sci

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Polymers have been identified as replacement materials for metallic liners in composite overwrapped pressure vessels (COPVs) for future space launchers. PEEK, Nylon, and PVDF plastics formed from base powder grades have been permeability tested to determine their susceptibility to the diffusion of helium through flatwise panel cross sections. Permeability, diffusion, and solubility coefficients have been obtained for each material with PVDF and PA11 grades showing the lowest permeability coefficients and hence the best barrier properties to permeation. Crystallinity percentages and internal air void contents in the polymer samples have also been used to assess the differences in permeability between materials with an analysis of void dispersion effects given through X-ray CT scanning techniques. The measured permeability coefficients have been used to assess the ability of all materials tested to act as a functional polymer liner in a standard COPV with final leak rates predicted based on liner thicknesses and weights. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43675.

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“…The relatively large permeability observed for all PSU-QA samples, in comparison with SPEEK membranes showed previously, can be related to the higher permeation values of PSU in comparison with PEEK [23][24][25][26] , although in SPEEK the Donnan effect is absent.…”

Section: Anion-conducting Membranes: Psu-qa and Sa-peekmentioning

confidence: 75%

“…PSU results more permeable to hydrogen (788.4 vs 108.6 cm 2 min -1 ) 25,26 and oxygen (82.8 vs 6.6 cm 2 min -1 ) 25, 27 gas.…”

Section: Introductionmentioning

confidence: 94%

Comparative study of the cation permeability of protonic, anionic and ampholytic membranes

2017

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The vanadium ion permeability of various ion-conducting polymer membranes was determined using a home-made apparatus. The study includes proton-conducting sulfonated poly(ether ether ketone) (SPEEK) with various cross-linking degrees, anion-conducting membranes, such as polysulfone with quaternary ammonium groups (PSU-QA) and sulfaminated PEEK (SA-PEEK), and amphoteric membranes based on PEEK containing both sulfonic and sulfonamide groups (SAM-PEEK) that can conduct both cations and anions. The polymer structure was investigated by NMR spectroscopy. The permeability of SPEEK decreases with the cross-linking degree and can be up to two orders below the permeability of a Nafion 117 reference membrane (1.4 10 -6 cm 2 /min). The cation permeability of SA-PEEK attains values as low as 5.0 10 -10 cm 2 /min, whereas amphoteric SAM-PEEK has a cation permeability of 7.0 10 -10 cm 2 /min. A factor or merit is introduced, defined as the ratio of ion conductivity and ion permeability ; the highest value, corresponding to the best compromise of high ion conductivity and low permeability of electrochemically active ions, is found for highly cross-linked SPEEK, SA-PEEK and SAM-PEEK membranes. The influence of the polymer backbone (PEEK or PSU), the degree of cross-linking, determined by NMR spectroscopy, and the grafted ionic groups (sulfonic acid, sulfammonium, and quaternary ammonium) on the cation permeability is discussed.

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Permeation resistance of poly(ether ether ketone) to hydrogen, nitrogen, and oxygen gases

Cited by 23 publications

References 9 publications

The crosslinking of poly (ether ether ketone): Thermally and by irradiation

The crosslinking of poly (ether ether ketone): Thermally and by irradiation

Helium permeability of polymer materials as liners for composite overwrapped pressure vessels

Comparative study of the cation permeability of protonic, anionic and ampholytic membranes

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