High-precision gravimetric technique for determining the solubility and diffusivity of gases in polymers

Wong, Betty; Zhang, Zhiyi; Handa, Y. P.

doi:10.1002/(sici)1099-0488(19980915)36:12<2025::aid-polb2>3.0.co;2-w

Cited by 108 publications

(108 citation statements)

References 5 publications

Supporting

Mentioning

102

Contrasting

Unclassified

Order By: Relevance

“…The diffusion coefficients of CO 2 at various pressures were determined by fitting the sorption kinetic data to a hybrid model that combines both short and long-term Fickian diffusion equations. 28 The obtained values of diffusion coefficient range from 5.5 × 10 -9 to 1.4 × 10 -7 cm 2 /s in the tested pressure range 0.34-5.5 MPa. In systems whereby the solubility of the gas in the polymer is high, the diffusion coefficient as a function of pressure exhibits a concentration dependent behavior, and hence a sharp increase in diffusion coefficient is observed indicating a transition from glassy to the rubbery state in the polymer.…”

Section: Resultsmentioning

confidence: 91%

Layered Open Pore Poly(l-lactic acid) Nanomorphology

et al. 2006

View full text Add to dashboard Cite

show abstract

Section: Resultsmentioning

confidence: 91%

Layered Open Pore Poly(l-lactic acid) Nanomorphology

et al. 2006

View full text Add to dashboard Cite

show abstract

“…35 Polymer samples were placed in the balance and evacuated for 48 h. CO 2 gas was added in small pressure steps while the weight change as a function of time was recorded every 10 s until equilibrium for each pressure step was established. Sorption studies for a desired pressure range in this manner were carried out at 25 and 0 • C. Blank runs were also carried out under similar experimental conditions and solubility data were corrected for balance zero shift.…”

Section: Gas Solubility Measurementsmentioning

confidence: 99%

Carbon dioxide‐induced crystallization in poly(L‐lactic acid) and its effect on foam morphologies

Liao

Nawaby

Whitfield

2010

Polymer International

View full text Add to dashboard Cite

The effect of carbon dioxide (CO2) on the physical properties of poly(L‐lactic acid) (PLLA) and on the formation of crystalline domains was investigated. The presence of CO2 in the matrix was found to induce crystallization in PLLA, with the crystallinity increasing with increasing CO2 pressure. The combination of saturation conditions and formation of crystalline domains was studied for its effect on the formation of porous morphologies in PLLA. Moreover, the effect of CO2 on PLLA properties and formation of porous structures was further exploited by first creating crystalline domains in samples using CO2 at various pressures at 25 °C and then re‐saturating the same samples with CO2 at a constant pressure of 2.8 MPa and 0 °C. This paper reports on the solubility of CO2 at 25 and 0 °C in PLLA, crystallization and subsequent effect on foam morphologies when processed using different saturation cycles. Unique and intriguing morphologies were obtained by specifically controlling the properties of PLLA. Copyright © 2010 Crown in the right of Canada. Published by John Wiley & Sons, Ltd

show abstract

“…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]. By installing an electromagnetic coupling to transmit the sample weight to an external balance, it is possible to obtain a system called "magnetic suspension balance" [22].…”

Section: Sorption-desorptionmentioning

confidence: 99%

Transport Properties of Gases in Polymers: Experimental Methods

Flaconnèche

Martin

Klopffer

2001

Oil & Gas Science and Technology - Rev. IFP

111

View full text Add to dashboard Cite

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

show abstract

High-precision gravimetric technique for determining the solubility and diffusivity of gases in polymers

Cited by 108 publications

References 5 publications

Layered Open Pore Poly(l-lactic acid) Nanomorphology

Layered Open Pore Poly(l-lactic acid) Nanomorphology

Carbon dioxide‐induced crystallization in poly(L‐lactic acid) and its effect on foam morphologies

Transport Properties of Gases in Polymers: Experimental Methods

Contact Info

Product

Resources

About