Single and mixed gas diffusion through polyethylene films

Pino, M.; Duckett, R. A.; Ward, I. M.

doi:10.1016/j.polymer.2005.02.118

Cited by 32 publications

(27 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The value obtained by NMR is an order of magnitude higher than the one obtained by permeation experiments. Except this NMR value and the estimate from the extrapolation method, all experimental values corrected either by Equation (7) or by Equation (8) [7] and Pino et al [60]. a Estimated from Equation (6), b estimated from Equation (7), c estimated from Equation (8) Diffusion coefficient of methane versus concentration in the amorphous phase of PE at 298 K. Two series of simulations are presented: with (black) and without (red) an additional constraint of 80 MPa.…”

Section: Simulation Resultsmentioning

confidence: 99%

Gas Permeation in Semicrystalline Polyethylene as Studied by Molecular Simulation and Elastic Model

Memari

Lachet

Rousseau

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

> Development of Reactive Barrier Polymers against Corrosion for the Oil and Gas Industry: From Formulation to Qualification through the Development of Predictive Multiphysics ModelingDéveloppement de matériaux barrières réactifs contre la corrosion pour l'industrie pétrolière : de la formulation à la qualification industrielle en passant par le développement de modèles multiphysiques prédictifs Résumé -Perméation de gaz dans le polyéthylène semi-cristallin par simulation moléculaire et modèle élastique -Dans ce travail, nous utilisons la simulation moléculaire pour étudier la perméa-tion de deux gaz (CH 4 et CO 2 ) dans le polyéthylène. Ces simulations sont conduites à des températures inférieures à la température de fusion du polymère. Bien que dans de telles conditions, le polyéthylène soit à l'état semi-cristallin, des boîtes de simulation contenant exclusivement du polymère amorphe sont utilisées. Dans de précédents travaux [Memari P., Lachet V., Rousseau B. (2010) Polymer 51, 4978], nous avons montré que les effets de la morphologie complexe des matériaux semi-cristallins pouvaient être pris en compte de manière implicite par une contrainte ad-hoc exercée sur la phase amorphe. Dans le présent travail, nous montrons que cette approche peut être mise en oeuvre non seulement pour le calcul de propriétés d'équilibre mais également pour le calcul de propriétés de transport comme les coefficients de diffusion. De plus, en utilisant le modèle élastique de Michaels et Hausslein [Michaels A.S., Hausslein R.W. (1965) J. Polymer Sci. : Part C 10, 61], cette contrainte ad-hoc peut être reliée à la fraction de chaînes qui contribuent au terme d'énergie élastique dans le matériau. Nous constatons que les propriétés de transport dans les régions amorphes sont fortement influencées par cette fraction de chaînes. Abstract

show abstract

Section: Simulation Resultsmentioning

confidence: 99%

Gas Permeation in Semicrystalline Polyethylene as Studied by Molecular Simulation and Elastic Model

Memari

Lachet

Rousseau

2013

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

show abstract

“…The quantity of gas passing through the film is directly proportional to the difference in gas pressure on either side of the film and inversely proportional to the thickness of the film. In addition, it is directly proportional to the time during which permeation has occurred and to the exposed area of the sample [82,127]. Hence,…”

Section: Pressure-increase Method/differential Pressure Principlementioning

confidence: 99%

“…It involves dissolution of the penetrating substance, the permeant, in the plastic, followed by diffusion of the permeant through the film, and finally by evaporation of the permeant on the other side of the film, all driven by a partial pressure differential for the permeant between the two sides of the film [82,87,105,115,127,129].…”

Section: Barriers and Permeationmentioning

confidence: 99%

Applications of Plastic Films for Modified Atmosphere Packaging of Fruits and Vegetables: A Review

2009

View full text Add to dashboard Cite

Modified atmosphere packaging (MAP) of fresh produce relies on the modification of atmosphere inside the package achieved by the natural interplay between two processes: the respiration rates of the commodity and the permeability of the packaging films. MAP has been a proven technology to meet the consumer's demand for more natural and fresh foods, which is increasing day by day. Because of its dynamic phenomenon, respiration and permeation take place simultaneously, and it is necessary to design the MAP system and select the matching films to achieve desired atmosphere early and maintain as long as possible. To meet the desired film characteristics for MAP, the different plastic films are either laminated or coextruded. In this modern world, the packaging films of required gas transmission properties are made available through advanced technology. Although the MAP industry has an increasing choice of packaging films, most packs are still constructed from four basic sustainable polymers: polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyproylene (PP) and polyethylene (PE) for packaging of fresh produce. Polystyrene has also been used but polyvinylidene, polyester and nylon have such low gas permeabilities that they would be suitable only for commodities with very low respiration rates.

show abstract

“…The transmission of gases through a polymer can be specified in terms of the three processes namely, solubility of gases in the polymer, diffusion and permeation 8,9,10 . As the gas is brought in contact with one surface of the polymer membrane, it gets adsorbed on the surface of the polymer.…”

Section: Theorymentioning

confidence: 99%

Impact of Helium Permeability on Endurance and Altitude Control of Geostationary Stratospheric Airship - A Mathematical Model

Garg

Burnwal

Pallapothu

et al. 2011

11th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference

View full text Add to dashboard Cite

A geostationary stratospheric airship is lighter than air (LTA) platform to be used for several civil and military purposes. In this study, the impact of Helium permeation through the hull and ballonet skin is considered. Mathematical modeling of the system is being done to estimate the amount of helium and air transmission through the hull and the ballonet skin for a general airship system. Impact of permeation mainly affecting its ability to withstand gushes and also to maintain constant altitude is also shown in this study. A method is also devised so as to develop an open loop control system to maintain the altitude of the airship by maintaining the weight of the airship as constant. Both the cases with and without the altitude control are simulated by numerically solving the model using RK4 algorithm. The results obtained are discussed and appropriate conclusions are drawn from the analysis. = area 1 = hull skin area between region 1 and the atmosphere 2 = ballonet skin area in between region 1 and region 2 3 = hull skin area between region 2 and the atmosphere = flux of gas through membrane in m 3 /m 2 /day or moles/m 2 /day = proportionality constant = effusion constant of helium = effusion constant of air 1 = permeability constant for helium for hull skin material 2 = permeability constant for helium for ballonet skin material 1 = permeability constant for air for hull skin material 2 = permeability constant for air for ballonet skin material = molecular weight of air = molecular weight of helium = moles ℎ , = moles of air in region 1 in hull at time t , = moles of air in region 2 in ballonet at time t ℎ , = moles of helium in region 1 in hull at time t , = moles of helium in region 2 in ballonet at time t 1 = moles of gas on side 1 of the membrane 2= moles of gas on side 2 of the membrane = gas pressure = atmospheric pressure = differential pressure across the hull 2 1 = gas pressure in region 1 2 = gas pressure in region 2 1 = partial pressure of gas on surface 1 of the membrane 2 = partial pressure of gas on surface 2 of the membrane = gas constant = gas temperature = time = gas volume = total volume of the airship including hull and ballonet 1 = volume of gas in region 1 2 = volume of gas in region 2

show abstract

Single and mixed gas diffusion through polyethylene films

Cited by 32 publications

References 15 publications

Gas Permeation in Semicrystalline Polyethylene as Studied by Molecular Simulation and Elastic Model

Gas Permeation in Semicrystalline Polyethylene as Studied by Molecular Simulation and Elastic Model

Applications of Plastic Films for Modified Atmosphere Packaging of Fruits and Vegetables: A Review

Impact of Helium Permeability on Endurance and Altitude Control of Geostationary Stratospheric Airship - A Mathematical Model

Contact Info

Product

Resources

About