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Gas permeation through common elastomer sealing materials

  • Using a quadrupole mass spectrometer system the permeation of D2, He, Ne, Ar, Kr and Xe through EPDM (ethylene-propylene-diene rubber), Viton (fluoro rubber) and Silicone-rubber was measured as a function of temperature. The results for O-ring samples were compared with those for slab geometry. From the measured permeation functions the diffusion coefficients, the permeation coefficients and the solubilities of the gases in the elastomer materials were evaluated using a nonlinear fitting algorithm. The variations of these data with temperature yield the activation energies for diffusion and permeation as well as the heat of solution. The results confirm that the transmission of noble gases and of deuterium through elastomer materials is merely a physical process because the activation energies are far below common values for processes involving chemical reactions. The solubilities correlate well with the boiling temperatures of the gases and with the well depth of the Lennard-JonesUsing a quadrupole mass spectrometer system the permeation of D2, He, Ne, Ar, Kr and Xe through EPDM (ethylene-propylene-diene rubber), Viton (fluoro rubber) and Silicone-rubber was measured as a function of temperature. The results for O-ring samples were compared with those for slab geometry. From the measured permeation functions the diffusion coefficients, the permeation coefficients and the solubilities of the gases in the elastomer materials were evaluated using a nonlinear fitting algorithm. The variations of these data with temperature yield the activation energies for diffusion and permeation as well as the heat of solution. The results confirm that the transmission of noble gases and of deuterium through elastomer materials is merely a physical process because the activation energies are far below common values for processes involving chemical reactions. The solubilities correlate well with the boiling temperatures of the gases and with the well depth of the Lennard-Jones interaction potential between the gas atoms. The diffusion coefficients monotonically decrease and the activation energies monotonically increase with increasing molecular diameter of the gases.zeige mehrzeige weniger

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Autor*innen:Hans-Peter Weise, Klaus Ecker, Helmut Kowalewsky, Thomas Wolk
Dokumenttyp:Zeitschriftenartikel
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Vuoto
Jahr der Erstveröffentlichung:1990
Herausgeber (Institution):Associazione Italiana del Vuoto (AIV)
Verlag:Tamburini Ed.
Verlagsort:Milano
Jahrgang/Band:20
Ausgabe/Heft:2
Erste Seite:225
Letzte Seite:230
Freie Schlagwörter:elastomer; gas permeation; sealing material
ISSN:0391-3155
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:31.12.2015
Referierte Publikation:Nein
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