Gas sorption in poly(vinyl benzoate)

Kamiya, Yuichi; Mizoguchi, Keishin; Naito, Yasutoshi; Hirose, Takuji

doi:10.1002/polb.1986.090240305

Cited by 94 publications

(63 citation statements)

References 33 publications

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“…The principle is to quantify the weight variation of a polymer sample submitted to a gas, with an electronic balance for example. Introduced into a high-pressure (HP) cell, this balance allows to obtain tests at a pressure of 6 MPa and temperatures of about 80°C [18,19]. Some evolutions of this technique allow to perform measurements at a pressure of 12 MPa and a temperature up to 350°C with a resolution of 10 µg, for an initial weight of polymer sample of about 1 g [20,21].…”

Section: Sorption-desorptionmentioning

confidence: 99%

“…According to Equation (15), the value of t/l 2 for which the ratio M(t)/M ∞ is equal to 1/2 is expressed by the following equation [9]: (18) This is equivalent to the next relation (19), which gives the coefficient of diffusion [5, [8][9][10]14]: (19) In Figures 2 and 3, a theoretical curve of gas sorption in a polymer matrix and an experimental test of CO 2 desorption in a low-density polyethylene are respectively plotted.…”

Section: Analysis Of the Sorption-desorption Testsmentioning

confidence: 99%

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Transport Properties of Gases in Polymers: Experimental Methods

Flaconnèche

Martin

Klopffer

2001

Oil & Gas Science and Technology - Rev. IFP

109

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Résumé -Méthodes de mesure des coefficients de transport de gaz dans les polymères -La perméabilité aux gaz des polymères est une propriété inhérente à leur structure, qui résulte de la solubilisation des fluides dans la matière, puis de la diffusion de ces produits à travers la matrice polymère. L'aptitude d'un gaz à pouvoir traverser plus ou moins rapidement un matériau peut être mise à profit dans de nombreux domaines industriels. Des polymères très peu perméables sont par exemple recherchés dans des domaines aussi divers que la production pétrolière, l'emballage alimentaire ou le domaine automobile. Dans les applications pétrolières, la fonction principale des polymères est d'assurer l'étanchéité des structures telles que les conduites. Dans ce cas, les matériaux sont au contact de gaz à haute température et sous forte pression et les informations concernant les coefficients de transport dans ces conditions extrêmes ne sont généralement pas disponibles dans la littérature. C'est pourquoi certains appareillages susceptibles de donner accès à ces valeurs ont été développés. Après quelques rappels théoriques des méthodes de calcul pour l'obtention des coefficients de transport et une brève revue bibliographique des différentes techniques expérimentales existantes, les différents montages expérimentaux étudiés sont décrits précisément.Mots-clés : perméabilité, diffusion, solubilité, polymères, gaz, méthodes expérimentales. Abstract -Transport Properties of Gases in Polymers: Experimental Methods -The permeability of gases in polymers is a property inherent to their structure, which results, firstly, from the absorption of fluids by the material, then, from the diffusion of these products through the polymer matrix. The capacity of a gas to cross more or less fast a material can be used in numerous industrial

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Section: Sorption-desorptionmentioning

confidence: 99%

Section: Analysis Of the Sorption-desorption Testsmentioning

confidence: 99%

Transport Properties of Gases in Polymers: Experimental Methods

Flaconnèche

Martin

Klopffer

2001

Oil & Gas Science and Technology - Rev. IFP

109

View full text Add to dashboard Cite

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“…We term such conditioning as "pressure conditioning". Recently, the plasticization of glassy polymers by sorbed gas has been reported, 8 -1 7 which might decrease an unrelaxed volume in glassy polymer and reduce Tg of glassy polymer-sorbed gas system. 12 This pro-vides information on the control of permeability of glassy polymers.…”

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confidence: 99%

Influence of Pressure Conditioning on the Gas Transport Properties of Imidized Polyamic Acid Films

Hachisuka

Tsujita

Takizawa

et al. 1989

Polym J

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ABSTRACT:The influence of pressure conditioning on the gas transport properties of various imidized polyamic acid [PAA] films was investigated. The variation of sorption and permeation caused by CO2 pressure conditioning was interpreted using dual-mode sorption and partial immobilization models. The sorption amount of CO2 at 25"C of unimidized PAA film increased markedly by pressure conditioning above 30atm of CO2 • It was found that unimidized PAA film was plasticized at 25' C at a pressure above 30 atm of CO2 and the film cooled relatively quickly to liquid N2 temperature and possibly contain a frozen microvoid or free volume between polymer segments. The sorption amount of CO2 of imidized PAA films also increased by pressure conditioning at 60 atm of CO2• This can be attributed to increase of unrelaxed volume due to pressure conditioning as shown by increase of Langmuir sorption capacity CH'· The increase in CH' of pressure conditioned films with low imide content was larger than that with high content. T.he diffusion coefficients of Henry and Langmuir modes of CO2 for imidized PAA film, D0 and DH, also increased by pressure conditoning. The increase of DH of each imidized PAA film was more marked than that of D0 • KEY WORDS Sorption / Diffusion / Polyamic Acid / Imidization / CO2 / Plasticization / Pressure Conditioning/ Langmuir Sorption Capacity Term/ It is well-known that sorption and permeation of gases in glassy polymer films are quite different from those in rubbery polymer films. This difference can be attributed to the fact that glassy polymers have unrelaxed volume or microvoid frozen in nonequilibrium state between segments. In general, the transport properties of glassy polymers have been analyzed on the basis of the dual-mode sorption 1 ·2 and partial immobilization models. 3 We reported that the nonequilibrium state varied by "thermal conditioning", e.g., quenching from above the glass transition temperature (Tg) or sub-Tg annealing. 4 -7 It was found that gas transport properties were influenced by nonequilibrium nature. Namely, gas solubility and diffusivity were enhanced by quenching from above Tg and decreased by sub-Tg annealing, reflecting that unrelaxed volume varies by thermal conditioning.

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“…4 But in these investigations plasticization of the glassy polymers occurred gradually during the penetrant-sorption in the polymers due to their non-equilibrium nature. 5 This produced factors which complicated the analysis of the transport phenomenon using the dual mode transport theory. 4 Additionally, the nature of a frozen free volume or a microvoid as the Langmuir sorption site is not yet elucidated and there still remains a degree of uncertainty.…”

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confidence: 99%